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Circuit left voltmeter = 10V, right voltmeter = 8V, 4Ω on right
Voltage across R = 10 − 8 = 2V Current I = V across 4Ω / 4 = 8/4 = 2 A
(a) Current through R = 2 A
(b) R = 2V / 2A = 1 Ω
(c) Battery P.D. = 2 + 8 = 10 V