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Charging a Capacitor and Constant Current

In order to charge a capacitor at constant current a variable resistor is placed in the circuit to keep the current constant. The charge on the Capacitor is Q = It where Q is charge in coulombs, t is time in seconds and I is current in amps.The potential difference across the capacitor can be measured with a voltmeter.

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Specification: AQA Physics (7408), A-level, 3.7.4.4 Capacitor charge and discharge. Topic: Capacitors.

Key terms in this lesson

Motor effect
The force experienced by a current-carrying conductor placed in an external magnetic field, resulting from the interaction between the field and the field created by the current.

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