Question

A heating element in a toaster dissipates 800 W when run at 110 V. How much charge passes through the heating element in 1 minute? Please show all of your work. 

Express your answer to two significant figures and include the appropriate units.

Answer 1

The amount of current passing through the heating element is

$$ I=\frac{P}{V}=\frac{800 \mathrm{~W}}{110 \mathrm{~V}}=7.27 \mathrm{~A} $$

The amout of required charge is

$$ Q=I t=(7.27 \mathrm{~A})(60 \mathrm{~s})=436 \mathrm{C}=440 \mathrm{C} $$