\begin{problem*}{21.53}
An electric heater is rated at $P_H = 1500\U{W}$,
 a toaster at $P_T = 750\U{W}$, and
 an electric grill at $P_G = 1000\U{W}$.
The three appliances are connected to a common $V = 120\U{V}$
 household circuit.
\Part{a} How much current does each draw?
\Part{b} Is a circuit with a $V_{max} = 25.0\U{A}$ circuit breaker
 sufficient in this situation?
 Explain your answer.
\end{problem*} % problem 21.53

\begin{solution}
\Part{a}
Using $P=IV$ we have
\begin{align}
 I_H &= \frac{P_H}{V} = \ans{12.5\U{A}}  &
 I_T &= \frac{P_T}{V} = \ans{6.25\U{A}}  &
 I_G &= \frac{P_G}{V} = \ans{8.33\U{A}}
\end{align}

\Part{b}
If all the appliances are running together, the circuit draws
\begin{equation}
 I = I_H + I_T + I_G = 27.1\U{A}
\end{equation}
So you will be fine with a $25\U{A}$ breaker unless you plan to run
all three at the same time.
\end{solution}
