How much electric is used in like terms?

If my cordless drill is 18v. How much electric from a 110v ac system does it take after its converted to dc in the battery to charge that battery. Going from the wall to the charger to the battery? Simplified: does it take 18v of converted power to charge an 18v battery? 20v? 36v? In essence, does it take 50cents... show more If my cordless drill is 18v. How much electric from a 110v ac system does it take after its converted to dc in the battery to charge that battery. Going from the wall to the charger to the battery? Simplified: does it take 18v of converted power to charge an 18v battery? 20v? 36v? In essence, does it take 50cents of electric to get a 10cents charge?
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