A cordless power tool motor is rated at 350 W during full po

A cordless power tool motor is rated at 350 W during full power operation. The tool is driven by a rechargeable 18 V battery that is rated at 3.0 A-hr. For how long will the tool operate before the battery is discharged? Report your answer in min. milwaukee

Solution

Power, P = V I

350 = 18 ( I)

I = 19.44 A

Battery rating -> 3 A hr

{ that means 3 A current is drawn from battery then it will last for 1 hr}

so when 19.44 is current is drawn then

t = 3 / 19.44 = 0.154 hr

t = 0.154 x 60 min/hr = 9.26 min