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Download V Experiment to illustrate the principle of operation of the Potentiometer 4EM
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4EM Experiment to illustrate the principle of operation of the Potentiometer 1. Set up a variable potential divider circuit as shown below. 6v d.c. supply X Y S V figure 1 Read the voltmeter with the sliding contact, S, at different positions. Results Distance of s from X zero (XY)/4 (XY)/2 3(XY)/4 XY Voltmeter Reading Conclusion _________________________________________________________ _________________________________________________________ 2. Measure the voltage of a battery (“battery A” in the diagram on the next page). Let this voltage be V1. Voltage V1 = __________ volts 1 With the circuit above, adjust the position of S so that the voltmeter indicates a voltage equal to V1. Leave S in this position but change the circuit to the one shown in the figure 2. 6v d.c. supply X Y S A figure 2 a) The bulb does not light because ________________________________________________________ ________________________________________________________ ________________________________________________________ b) Move S to X. The bulb lights. Which supply is lighting the bulb, battery A or the 6v supply ? ____________________ c) Move S to Y. The bulb lights. Which supply is now lighting the bulb ? ____________________ The circuits used in this experiment are called potential divider circuits. A POTENTIOMETER is a form of potential divider which can be used to measure an unknown voltage by comparing it with a known voltage. In its simplest form, a potentiometer consists of a piece of resistance wire of uniform cross-section about 1m long, mounted on a support with a linear scale placed near it. © David Hoult 2001 2