As computers are being used more and more in education, there will be soon no role for teachers in the classroom. Do you agree or disagree?

The Core of A 20V Cordless

Drills

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The heart of a cordless

tool

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is its

motor

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and its

battery

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. The best 20V cordless

drills

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have a

brushless

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motor

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and a 12, 18, 24- or 36-

voltbattery

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volt battery

at their core. You may have noticed that all these

batteries

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have various

Ampere-Hour

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values.

For example

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, you will find a 20V

battery

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with a

capacity

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of 1.5, 3, 4, 5, 6, 9 and 12Ah. What Is the Relationship Between

Voltage

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and

Ampere-Hours

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? A

battery

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's electrical potential is called

voltage

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. It is the measure of the

power

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or

energy

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in the

battery

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. An ampere is the measure of the rate of current or electron flow through the conductor. The conductor is the wire laid into the

circuit

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.

Ampere-hour

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is the total amount of charge in a

battery

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that allows one ampere of current to flow through the

circuit

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in one hour. In corded

tools

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, it is measured in

amperes

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, i.e., the amount of

power

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drawn by the

tool

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is virtually infinite.

In other words

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,

voltage

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is the

power

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and

ampere-hours

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are equivalent to the

runtime

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. These two terms come from the

battery

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’s actual

capacity

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- the watts-hours.

Ampere-Hours

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x

Voltage

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= Watt Hours If you look at the label of the

batteries

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. The

capacity

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is mentioned in watt-hours. The larger the fuel tank - watt-hours the higher the

energy

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potential. If you dissect your

battery

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you will see it is made of individual

cells

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connected in

series

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. Each of these

batteries

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delivers a certain

voltage

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.

An

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A

show examples

18650

battery

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is a Li-ion cell

that is

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18mm by 65mm in dimensions. It is slightly larger than the AA

battery

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. Higher

capacity

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and discharge rate They are used in laptops, cordless

tools

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, and high drain devices.

This

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is because they have a higher

capacity

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and discharge rate. Typically,

an

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a

show examples

18650

battery

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is slightly more than 3.6 volts. In a fully charged state, they produce slightly more than 4V. There may be anomalies depending upon the

tool

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, temperature of the

ambiance

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ambience

show examples

, etc. But usually, it means if you need a 12 Volt

battery

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then

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string three of them in

series

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. If you need an18-volt

battery

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then

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connect 5

cells

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.

This

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means that if you want more

power

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simply add another cell in

series

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. In theory, you will

increase

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the

power

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by 4V. The

tool

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industry has set the standards to 12, 18, 20 and 36V. These standards form the basis of the

tool

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platforms and outdoor equipment. Increasing in

Voltage

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and

Ampere-Hours

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Now let us discuss how to

increase

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the

ampere-hours

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on the

tool

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. If you ignore certain factors 3.0

ampere-hour

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will

getyou

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get you

3

amperes

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of current in an hour. Unlike

voltage

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,

this

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is a variable number. You can draw a higher amperage from the

battery

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and get lesser

runtime

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.

This

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is a linear relationship. You get 2.5

amperes

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on a 5.0 amp-hour

battery

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and 2 hours of

runtime

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. You can draw 6

amperes

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from a 3-

ampere-hour

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battery

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and get only 30 minutes of

runtime

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. Most Li-ion

batteries

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run around 2.0 Ah. You can

increase

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the

voltage

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by connecting the

cells

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in

series

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.

This

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means if you connect three 3.6V

battery

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in

series

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you get 12V but only 2.0 Ah. To get a higher

ampere-hour

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(Ah) you need to connect them parallel.

This

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means if you connect three 3.6V

battery

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in parallel you get 3.6V but at 6.0 Ah. So how to

increase

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capacity

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and

runtime

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? Most manufacturers connect the 5

cells

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in

series

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to get 20 volts.

Then

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they connect another set in parallel.

This

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way we get 20V while the

runtime

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increased to 4.0 Ah. You could add another set in parallel to get 6.0 Ah and so on. 20V

batteries

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seem to be the base unit on which other capacities are built.

For example

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, a 20V Max with 5.0Ah is usually a 5S2P configuration. Here there are 5

cells

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in

series

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and 2

cells

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in parallel.

This

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means a total of 10

cells

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arranged in two sets of 5. If you need a 40V Max at 2.5 Ah

then

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simply change the configuration to 10S or 10

series

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. The Anomalies that affect

Battery

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Capacity

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In real working conditions parameters like temperature - too hot or too cold. Environmental conditions

such

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as vibrations, etc. affect the Ah and

voltage

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. As these conditions are inevitable at a job site manufacturers set a better expectation by listing a lower rating.

For example

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- 18-volt nominal

instead

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of 20V Max. There are advancements and innovations in

battery

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research. People play with the chemistry and physics of the

battery

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. They tweak and tinker with words like cathode, anode, and electrolytes. And you begin to see the difference between impedance, resistance, and other fun words to get better performance. And suddenly an 18 volt and 3 Ah

battery

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can deliver 4 Ah and even 5.

Batteries

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from different companies deliver different performances.

This

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is due to different safeties, better housing designs, and electronic controls. The change in wiring configuration adds more

power

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,

ampere-hours

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, etc.

Brushless

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Motors

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on Cordless

Drills

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A

drills

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motor

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is designed to convert electrical

energy

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into mechanical

energy

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. A

brushless

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motor

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does not have a brush.

This

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elimination of the brush from the

motor

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allows more area for a larger

motor

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. As there is no friction the

motor

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and the

tool

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run cooler. The working principle of brushed and

brushless

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motors

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is similar. The windings on the

motor

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become energized. A temporary magnetic field is generated that repels

/

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attracts the permanent magnets.

This

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magnetic

force

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turns the shaft and allows the

motor

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to do

work

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. In the case of a

drill

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, it would be boring a hole. In the case of a driver, it would be turning the screw. As the shaft turns the electric current is routed through different sets of windings of wire.

This

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maintains the electromotive

force

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of attraction and repulsion and the motion of the

motor

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continues. The benefits of

brushless

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DC

motors

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are improved performance and efficiency. There are little mechanical wear and increased

torque

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per watt. The

tool

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is more efficient due to higher

torque

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to weight ratio. As there is less wear the

tool

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is low maintenance. The

tool

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has a longer lifespan and quiet. There is no commutator, ionizing sparks or brush erosion.

Besides

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the electromagnetic interference (EMI) is nearly eliminated. These

tools

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are

also

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smaller, compact and

energy

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-efficient. The current is regulated by the

circuit

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board

instead

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of being delivered directly to the

tool

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. The

tool

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senses the resistance and draws only that much current required to do the

work

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. Essential Features on The Best 20V Cordless

Drills

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The features to look for on a cordless

drill

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are...

Voltage

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- The more the

voltage

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the more powerful is the

drill

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. There are light-duty

drills

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(6 - 12V) for small jobs around the house. There are general purpose

drills

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(12 - 18V) for driving and drilling works and some heavy

work

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.

Lastly

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, the heavy-duty

drills

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(18 - 24V and sometimes 36V) can be used for construction and heavy works like hammering, etc.

Torque

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- As

this

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is a

drill

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and driver

tool

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it should have a turning

force

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to make holes or turn a fastener.

This

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turning

force

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is called

torque

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. It is indicated in Newton-meters (Nm) or Inch-Pound (in-lbs.). Most

drills

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are made

such

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that they can handle plastics, wood, drywall, etc. Harder materials like concrete, metal and other hard surfaces need less speed and more

torque

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. To

work

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on harder materials, choose a

drill

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with a

torque

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of 46Nm or more.

Power

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(UWO) is a standard for measuring the maximum

power

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of the

drill

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. It is derived from

torque

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and speed.

Thus

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, the higher these values the higher the

torque

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. Drive

Motor

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-

Brushless

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motors

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have

circuit

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boards that help modulate the current,

torque

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,

power

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and

ampere-hours

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. They are quiet and efficient, too. Features

such

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... Chuck size - There are 1

/

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4-inch, 3

/

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8-inch, and 1

/

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2-inch chucks. The chuck size determines the type of

drill

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bits the

tool

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can hold.

Batteries

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- The

battery

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technology had advanced by leaps and bounds. Li-ion

batteries

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with chips carry algorithms that help in the efficient use of

power

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. Ensure you have an extra

battery

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.

This

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way while one is down and charging you are working - using the other.

This

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improves your efficiency and eliminates downtime. Speeds -

Drills

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can have dual speeds or variable speeds on them.

This

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allows you to

work

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on various materials - hard and soft. Charger or Charging station -

work

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on the principle of alternating magnetic fields. There are

voltage

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changing

batteries

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available that let you run the

tool

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according to

power

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usage. Grip - As you are going to be working long hours.

Besides

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, you want to do a precise job. Look for a

tool

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with an ergonomic design and rubberized non-slip grip. Combo Kits - Many manufacturers offer kits that have a

drill

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and driver. Some may have a hammer attachment while others may carry bits. It is always prudent to pick the

tools

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of your trade as a set as

this

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ensures you have the right sizes.