Resistors of 4 ohm and 6 ohm are connected in series to a 30 V battery. What current flows?

Answer and explanation

Correct answer: B. 3 A

  1. Step 1: In series the total resistance is 4 + 6 = 10 ohm.
  2. Step 2: I = V / R = 30 / 10 = 3 A.
Answer
3 A.
Why not the others: '7.5 A' uses only the first resistor; '5 A' uses only the second resistor; '10 A' gives the total resistance in ohms, not the current.

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