A-LevelPhysicsD.C. circuitsOct/Nov 2011Paper 1 Q351 Mark
A power supply of electromotive force (e.m.f.) 12 V and internal resistance 2 Ω is connected in series with a load resistor. The value of the load resistor is varied from 0.5 Ω to 4 Ω. Which graph shows how the power P dissipated in the load resistor varies with the resistance of the load resistor? [Figure 35.1]
Agraph showing power peaking at load resistance 2 Ω
Bgraph showing power at a minimum at load resistance 2 Ω
Cgraph showing power increasing linearly with load resistance
Dgraph showing power increasing with load resistance, curving upwards
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