Lesson: Chapter 19 — Current Electricity

19.4. Ohm's law 6 of 7 Reset answers

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Question 6

A bulb is connected to a 12 V supply and a current of 0.5 A flows. What is the resistance of its filament? (Exercise 19.2, part 1)

A 6 Ω B 0.04 Ω C 12 Ω D 24 Ω

The right answer is the one marked above.

24 Ω. R = V ÷ I = 12 ÷ 0.5 = 24 Ω.

Dividing by a number smaller than one makes the answer bigger, which is worth expecting rather than being surprised by. Half an ampere needs twice the resistance a full ampere would.

Answer the question to continue.