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What is a Component?

A component is any device in an electric circuit
that transfers electrical energy into another form.

A diode, motor, lamp, LDR, resistor and a thermistor
are all examples of electrical components.
Each component has its own circuit symbol.

What is a Test Circuit for a Component?

The circuit diagram of
a test circuit for a component is shown below.

Standard Test Circuit for an Electrical Component

A variable resistor placed in series with a component
can change the voltage across the component
and change the amount of current flowing through it.

A range of values obtained from the readings on
the voltmeter and ammeter
are used to
make a plot of current against voltage.

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