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Solutions to Period 12 Exercises

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... Electric current indicates electric charges in motion. Dynamics deals with bodies in motion. The science of electricity in motion is known as electrodynamics The voltmeter is a high-resistance galvanometer used to measure voltage. It measures the potential difference across any two points in an elec ...
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... and hence there is a large positive current from the p side to the n side ...
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Current source



A current source is an electronic circuit that delivers or absorbs an electric current which is independent of the voltage across it.A current source is the dual of a voltage source. The term constant-current 'sink' is sometimes used for sources fed from a negative voltage supply. Figure 1 shows the schematic symbol for an ideal current source, driving a resistor load. There are two types - an independent current source (or sink) delivers a constant current. A dependent current source delivers a current which is proportional to some other voltage or current in the circuit.
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