A-LevelPhysicsD.C. circuitsMay/June 2020Paper 2 Q610 Marks
(a) A battery of electromotive force (e.m.f.) 7.8V and internal resistance r is connected to a filament lamp, as shown in Fig. 6.1. [Figure 6.1] A total charge of 750C moves through the battery in a time interval of 1500s. During this time the filament lamp dissipates 5.7 kJ of energy. The e.m.f. of the battery remains constant.
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