Electricity can only pass in the direction in which the arrow points.
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Diode.
The diode will allow electricity to pass through it
in one direction only.
The circuit symbol is like
an arrow pointing to a bar.
Electricity can only pass in the direction in which the
arrow points.
A graph of the characteristics of the diode are shown below.
The graph does not go through the origin because a small voltage is needed
before the diode starts to conduct electricity and allow a current to flow.
The diode is mainly used in circuits with alternating current.
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