Question

A smartphone consumes 4 watts of power when charging. Your power company charges 12 cents per kilowatt hour (kWh). If you leave your smartphone plugged in to the wall outlet for 24 hours, how many cents does this cost

Answer 1

`C=1.15cents`

Explanation:

Generally the equation for is mathematically given by

Charge Power P=4watts

Rate r=12cents/hour

Time consumed T=24

Generally

Power consumed by smartphone in 24 hours

`P_t=P*T\\\\P_t=24*4`

`P_t=0.096kwh`

Therefore the Cost will be

`C=12*0.096kwh`

`C=1.15cents`