Physicshard · Past Paper
In a series circuit of three identical resistors, the total power dissipated is P. If they are reconnected in parallel to the same source, the total power will be:
AP/3
B3P
C9P
DP/9
✓ Correct Answer: C — 9P
R_series = 3r, P = V^2/3r. R_parallel = r/3, P' = V^2/(r/3) = 3V^2/r. Therefore P' = 9P.
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