Reviewed CSCA Physics question · Standard

A 12 V battery is connected to a circuit with two resistors in series: 4 Ω and 8 Ω. What is the current flowing through the circuit?

0.5 A
1 A
1.5 A
3 A

Show the answer and explanation

Correct answer

B. 1 A

Principle or equation

Ohm's law: V = I R. For series resistors, total resistance R_total = R1 + R2.

Why this answer is correct

R_total = 4 + 8 = 12 Ω. I = V / R_total = 12 / 12 = 1 A.

Example

If a 6 V battery is connected to a 2 Ω and 4 Ω series combination, I = 6 / 6 = 1 A.

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