Test Circuit for a Component.
Anything in an electric
circuit (lamp, resistor, motor, diode etc.)
is called a component.
Each component has its own circuit
symbol.
A test
circuit can be used
to find the characteristics of a component.
A variable
resistor
(sometimes called a rheostat when
placed in series in a circuit)
can change the amount of current flowing through the component,
and the voltage
across it it.
Values obtained from the voltmeter and ammeter
are used to plot the graphs shown on the previous pages. The
shape of the graph describes the characteristics of the component.
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