Real ammeters and voltmeters are close to perfect but not ideal. On this page you will find out how ammeters and voltmeters are optimised for use.
Use quizzes to practise application of theory.
START QUIZ!
A 9V battery is connected to two 10 kΩ resistors.
What is the pd across resistor A?
Half of pd is dropped across each
A 9V battery is connected to two 10 kΩ resistors.
A voltmeter of resistance 10 kΩ is used to measure the pd across A. What result will it give?
The combined resistance of A plus voltmeter wil be 5 kΩ so th the pd across A will be 1/2 the pd across the other resistor. The total is 9 V so that makes 6 V across one and 3 V across the other.
A 9V battery is connected to two 10 kΩ resistors.
A voltmeter of resistance 10 MΩ is used to measure the pd across A. What result will it give?
The voltmeter has a very high resistance so will not draw any current
How much of Ammeters and voltmeters have you understood?
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