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Experiment objective:
A simple way to check
if the electric circuits that are connected are closed
circuits. For example it can be use to check for continuity
of a light bulb, electric iron, fuse etc.
Circuit descriptions:
The light emitting diode D serves as an
indicator for open/ closed circuit. When there is current
flow through D, D will give out light, which indicates
that the circuit is closed. If current cannot flow through
the D, D will not glow, which means that the circuit
is opened.
The experiment:
Connect the circuit as shown in diagram
figure 1.1. When W1 and W2 are touching each other,
D lights up, which indicates that the circuit is connected
correctly. In case D does not glow, check its polarity
and re-install it. Now you can use it to check other
circuits to see if they are closed or opened. You may,
for example, use the device to check the condition of
light bulbs.
Functions of electronic components
(Summary):
*Light-emitting
diode used as circuit open/ closed indicator.
*Resistor
for limiting current flow.
*Battery
for power supply.
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