Electric usage : 8 Amp Corded Drill vs 24 Volt Cordless dril

[Doug Garson]

Try to simplify this .

Using that same cordless drill with 2 1/2 inch Wood Screws drilling through 8/4 Red Oak; how long would the battery last , before it dies out, and needs to be recharged ? If it is a 2 Amp Hour Battery, would it last 2 hours ?

Amp hour (Ah) is a unit of measurement that has nothing to do with power and it’s a totally different unit than Amp (Ampere). Amps are used to describe amp hour, but they are different units of measurement.
Amp hour describes the capable charge of a battery. Theoretically, we can draw 2 amps, continuously, for 60 minutes before our 2 amp hour battery is drained. Just think of amp hour as a way to know that one battery holds more of a charge than another. Just like the size of the gas tank in a car.
That said, if the drilling operation drew one amp continuously then yes a 2 amp hour battery would last two hours.

[Frank Pratt]

I guess it depends on which drill is being used to install dominos or biscuits, or the other way around.

[Dave Sabo]

Try to simplify this .

Using that same cordless drill with 2 1/2 inch Wood Screws drilling through 8/4 Red Oak

Hope you're not planning on just going at it with the screws without pre-drilling a pilot hole ? Because at that point, it ain't gonna matter which scenario uses less electricity. The results are going to be poor using either tool.

[Andrei Telitsyn]

The cordless drill could draw approximately 24 watts of power for 2 hours from the battery. That wouldn’t be enough energy to drill itself out of a wet paper bag.

Not exactly. Cells in those battery packs are designed for high current discharge and the dependency is far from linear.
So, I would say, 2Ah would yield about 3 minutes at max torque. With total power, assuming standard values of 20V and 30A, can be somewhere close to 0.75HP.

[Frank Pratt]

Not exactly. Cells in those battery packs are designed for high current discharge and the dependency is far from linear.
So, I would say, 2Ah would yield about 3 minutes at max torque. With total power, assuming standard values of 20V and 30A, can be somewhere close to 0.75HP.

You're assuming close to 100% efficiency, which is not even close to the actual efficiency.

[Andrei Telitsyn]

You're assuming close to 100% efficiency, which is not even close to the actual efficiency.

That would be the upper limit, in terns of 'energy spent'. Portion of consumed energy would pay for inefficiencies, yes.