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Question 17

From Physics HL Paper 1A (May 2025, TZ3)

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  1. Three identical resistors, R1R_1, R2R_2 and R3R_3, each of resistance 2 Ω2 \, \Omega, are connected to a cell of negligible internal resistance as shown. When switch S is open, the power dissipated by R1R_1 is 18 W.
Circuit diagram with resistors R1, R2, R3, a switch S, and a cell for question 17.
Circuit diagram with resistors R1, R2, R3, a switch S, and a cell for question 17.

What is the power dissipated by R1R_1 when S is closed?

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