If a 500 Ω, 1200 Ω and 10 kΩ resistor are connected in parallel across a 25 V source, how much current flows through the 1200 Ω resistor?
A)20.8 mA
B)50 mA
C)2.4 mA
D)2.5 mA

Question

Quizplus · Accepted Answer

The current through a resistor in parallel is the same as the current through the source. The total resistance of the circuit is 1/((1/500)+(1/1200)+(1/10000)) = 428.57 Ω. The current through the source is 25 V / 428.57 Ω = 58.33 mA. The current through the 1200 Ω resistor is 58.33 mA * (1200 Ω / 428.57 Ω) = 20.83 mA.

If a 500 Ω, 1200 Ω and 10 KΩ Resistor