Question

A toaster is used an average of 5.0 h a month. The toaster draws 8.0 A of current from a 110 V outlet. If electricity costs 8¢ per kW•h, how much will it cost to operate the toaster for one year?

Steps please.

Answer 1

The cost is `=4.22$`

Explanation:

The current is `I=8A`

The voltage is `U=110V`

The power is

`P=UI=110*8=880W`

The time `"per month"` is `t=5h`

The power consumption `"per month "` is

`P_m=P*t=880*5=4400Wh`

The power consumption `"per year "` is

`P_y=P_m*12=4400*12=52800Wh=52.8kWh`

Cost of electricity is `c=0.08$ " per kWh"`

Annual cost is

`c_a=P_y*c=52.8*0.08=4.22$`