A-LevelPhysicsD.C. circuits9702/12 · May/June 2015 · Q361 Mark
A potential divider circuit consists of fixed resistors of resistance 2.0 Ω and 4.0 Ω connected in series with a 3.0 Ω resistor fitted with a sliding contact. These are connected across a battery of e.m.f. 9.0 V and zero internal resistance, as shown. [Figure showing a 9.0V battery, a 4.0Ω resistor, a 2.0Ω resistor, and a 3.0Ω variable resistor (potentiometer). The output voltage is taken across a portion of the 3.0Ω resistor and the 2.0Ω resistor, in parallel with the 4.0Ω resistor.] What are the maximum and the minimum output voltages of this potential divider circuit?
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Amaximum voltage/V: 4.0, minimum voltage/V: 2.0
Bmaximum voltage/V: 5.0, minimum voltage/V: 2.0
Cmaximum voltage/V: 9.0, minimum voltage/V: 0
Dmaximum voltage/V: 9.0, minimum voltage/V: 2.0
✓ Correct answer
B: maximum voltage/V: 5.0, minimum voltage/V: 2.0
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