If 3, 30ohm resistors are connected in parallel and supplied with 20VDC, what is the total current flow in the circuit?

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Prepare for the PMMI Industrial Electricity Test with quizzes featuring flashcards and multiple-choice questions. Each answer is explained with hints to ensure a thorough understanding. Gear up to excel in your exam!

Multiple Choice

If 3, 30ohm resistors are connected in parallel and supplied with 20VDC, what is the total current flow in the circuit?

Explanation:
Parallel connections give each resistor the same supply voltage, and the total current is the sum of the branch currents. Each 30-ohm resistor across 20 V draws I = V/R = 20/30 = 2/3 A. With three of them in parallel, the currents add: 3 × (2/3 A) = 2 A total. You can also see this by finding the equivalent resistance: 1/R_eq = 1/30 + 1/30 + 1/30 = 1/10, so R_eq = 10 ohms, and I = V/R_eq = 20/10 = 2 A. The total current flowing is 2 A.

Parallel connections give each resistor the same supply voltage, and the total current is the sum of the branch currents. Each 30-ohm resistor across 20 V draws I = V/R = 20/30 = 2/3 A. With three of them in parallel, the currents add: 3 × (2/3 A) = 2 A total. You can also see this by finding the equivalent resistance: 1/R_eq = 1/30 + 1/30 + 1/30 = 1/10, so R_eq = 10 ohms, and I = V/R_eq = 20/10 = 2 A. The total current flowing is 2 A.

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