O Levels Physics (5054)•5054/11/O/N/23
Explanation
Equivalent resistance in series and parallel circuits
Steps:
- Identify components: Assume circuit P has two resistors of R each in series; circuit Q has two resistors of R each in series.
- For series: Total resistance is sum of individual resistances.
- Calculate P: R + R = 2R.
- Calculate Q: R + R = 2R.
Why C is correct:
- Series combination formula Rt = R1 + R2 yields 2R for both circuits with two R resistors.
Why the others are wrong:
- A: Underestimates P (ignores series addition) and overestimates Q.
- B: Overestimates P but underestimates Q (confuses series/parallel).
- D: Identical to C, but listed as separate option (possible error).
Final answer: C
Topic: Series and parallel circuits
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