The diagram below shows passive components, resistors, capacitors and
inductors, and also electrical components such as switches, relays,
motors and lamps. Also shown are the symbols for wires that are not
joined (no physical electrical connection) and wires that are joined (a
physical electrical connection).
This
next diagram depicts active components, the difference between active
and passive is that active components require a power source to work,
whereas passive components do not. The top symbols represent vacuum tube
or thermionic devices. Although at one time, these were being replaced
by the smaller transistor and integrated circuits, they are finding
their way back into electronics for use in professional audio equipment
and some radio receivers.
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