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The top waveform shows
the ac supply.
The middle waveform
shows the switch
operation.
When the switch is
closed, the gate and
anode go positive on the
first positive half
cycle, and the thyristor
conducts during this
period.
On the next half cycle
they go negative and no
current flows.
As long as the switch is
closed, the thyristor
conducts on the positive
half cycles only.
When the switch is
opened, the thyristor
ceases to conduct on the
next negative half
cycle, and remains non
conducting.
The bottom waveform
shows the current
through the thyristor
and lamp.
The current comes in
BURSTS.
If the lamp is replaced
by a heater, and the
switch replaced by a
thermostat then it would
provide automatic
temperature control for
an oven.
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