If the Power Rating of A $400 - \Omega$ Resistor Is $0.800 \mathrm {~W}$

Multiple Choice

If the power rating of a $400 - \Omega$ resistor is $0.800 \mathrm {~W}$ , what is the maximum voltage that can safely be connected across the resistor?

A) $170 \mathrm {~V}$
B) $17.9 \mathrm {~V}$
C) $110 \mathrm {~V}$
D) $1.80 \mathrm {~V}$