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Write electrical use of the components i...

Write electrical use of the components in electrical circuit. Resistor,Rheostat,Ammeter and Voltmeter

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(i) Resistor is used to fix the magnitude of the current through the circuit.
(ii) Rheostat is used to regulate the current without changing the voltage source.
(iii) Ammeter is used to measure the current.
(iv) Voltmeter is used to measure the potential difference.
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