Sketch the circuits symbols for
Fig. 1.1 shows a circuit with a potentiometer.
Fixed ends AC are connected across the battery so that there is a full battery voltage across the whole resistor.
State the voltage output, Vout when the sliding connect is at
The resistor is now replaced with a uniform resistance wire connected between ends AC, as shown in Fig. 1.2a. The 28 V cell is replaced with a cell of unknown e.m.f.
Sketch a graph of Fig 1.2b to show the voltmeter reading V against length l as the jockey is moved from point A to point C.
A potentiometer can be used to compare e.m.fs of cells or potential differences.
A test cell is added to the circuit in Fig. 1.2a. A student sets up the circuit shown in Fig. 1.3.
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