Resistors of values 7 Ω,15 Ω,and 25 Ω are connected in parallel across a fresh battery.Which resistor dissipates the greatest power?
A)the 7-Ω resistor
B)the 15-Ω resistor
C)the 25-Ω resistor
D)All dissipate the same power when in parallel.

Question

Quizplus · Accepted Answer

In a parallel circuit, the voltage across each resistor is the same. Power dissipation in a resistor is given by $P = \frac{V^2}{R}$. With the same voltage across each, the resistor with the lowest resistance (7 Ω) dissipates the most power.

Resistors of Values 7 Ω,15 Ω,And 25 Ω Are Connected