Solve the problem.
-The power that a resistor must dissipate is jointly proportional to the square of the current flowing through the resistor and the resistance of the resistor. If a resistor needs to dissipate 343 watts of power when 7 amperes of
Current is flowing through the resistor whose resistance is 7 ohms, find the power that a resistor needs to
Dissipate when 8 amperes of current are flowing through a resistor whose resistance is 9 ohms.
A) 504 W
B) 72 W
C) 648 W
D) 576 W

Question

Quizplus · Accepted Answer

The power dissipated by a resistor is given by $P = I^2R$, where $P$ is the power in watts, $I$ is the current in amperes, and $R$ is the resistance in ohms. For the second scenario, $P = 8^2 \times 9 = 64 \times 9 = 576$ watts.

Solve the Problem. -The Power That a Resistor Must Dissipate Is Jointly Proportional