a. Explain why an ammeter is designed to have a low resistance. A student builds the circuit,
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a. Explain why an ammeter is designed to have a low resistance.
A student builds the circuit, as shown, using a battery of negligible internal resistance. The reading on the voltmeter is 9.0 V.
b i. The voltmeter has a resistance of 1200 Ω. Calculate the e.m.f. of the battery.
ii. The student now repeats the experiment using a voltmeter of resistance 12 kΩ. Show that the reading on this voltmeter would be 9.5 V.
iii. Refer to your answers to i and ii and explain why a voltmeter should have as high a resistance as possible.
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a An ammeter is designed to have a low resistance so that it does not significantly alter t...View the full answer
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Related Book For 
Cambridge International AS And A Level Physics Coursebook
ISBN: 9781108859035
3rd Edition
Authors: David Sang, Graham Jones, Gurinder Chadha, Richard Woodside
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