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QuizSeries and parallel circuits · 8 min

Quiz: series and parallel circuits

8 questions. Answer each one, then open Show the answer to check yourself. In Litmux Academy the quiz is marked and counts towards your certificate.

Question 1In a series circuit, what is the same for every part?

  1. The voltage
  2. The current
  3. The power
  4. The resistance
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Answer: B. The current

One path: the same current flows through each part.

Question 2In a parallel circuit, what is the same for every branch?

  1. The voltage
  2. The current
  3. The power
  4. The resistance
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Answer: A. The voltage

Every branch is across the same two points.

Question 3What is 1 kΩ + 2.2 kΩ + 4.7 kΩ in series?

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Answer: 7900 Ω

Series resistances add: 7.9 kΩ.

Question 4What is 6 kΩ in parallel with 3 kΩ?

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Answer: 2000 Ω

Product over sum: 18 / 9 = 2 kΩ.

Question 5Four 1 kΩ resistors in parallel make:

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Answer: 250 Ω

n equal resistors in parallel: R / n = 250 Ω.

Question 6Kirchhoff's current law says:

  1. Voltages round a loop add to zero
  2. The current into a junction equals the current out
  3. Current is used up by each part
  4. V = I × R
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Answer: B. The current into a junction equals the current out

Charge is conserved at every junction.

Question 7A 9 V loop has two resistors. One has 6.5 V across it. What is across the other?

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Answer: 2.5 V

KVL: 9 − 6.5 = 2.5 V.

Question 820 mA splits between 1 kΩ and 3 kΩ in parallel. The 3 kΩ carries:

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Answer: 5 mA

I = 20 × 1 / (1 + 3) = 5 mA.