If a 12 V source is connected to a 4 Ω resistor, what is the current?

Prepare for the Engineman EN A School Test 1. Utilize flashcards and multiple choice questions with detailed explanations to boost confidence and readiness for the test.

Multiple Choice

If a 12 V source is connected to a 4 Ω resistor, what is the current?

Explanation:
Ohm’s law is the key here: current equals voltage divided by resistance. With 12 V across a 4 Ω resistor, the current is 12 ÷ 4 = 3 A. The units V/Ω give amps, so 3 amperes makes sense. The other numbers would require different resistances: 6 A would need 2 Ω, 12 A would need 1 Ω, and 48 A would need 0.25 Ω, which aren’t the given resistor.

Ohm’s law is the key here: current equals voltage divided by resistance. With 12 V across a 4 Ω resistor, the current is 12 ÷ 4 = 3 A. The units V/Ω give amps, so 3 amperes makes sense. The other numbers would require different resistances: 6 A would need 2 Ω, 12 A would need 1 Ω, and 48 A would need 0.25 Ω, which aren’t the given resistor.

More practice questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy