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When the TRIAC switch is connected between the AC power supply and the motor, the power flow can be controlled by varying the RMS of the AC voltage.

The output frequency of a half wave rectifier is equal to the input frequency i.e 60 Hz.

As to converting from ac into dc diode with load resistance is used so it will perform same operation.

C-E provides both voltage and current gain as high so power is definitely high.

GATE, SOURCE, DRAIN AND SUBSTRATE, In some cases the substrate internally connected to the source.

It shows the frequency response curve for a band-reject filter.

Class B is used in push pull arrangement to get exact replica of the input.

Center-tapped secondary is used to create a 180 degree input to a rectifier.
A rectifier circuit whose transformer secondary is tapped to get the desired output voltage, using two diodes alternatively, to rectify the complete cycle is called as a Center-tapped Full wave rectifier circuit.
A center tapped full wave rectifier is a rectifier which uses a center tapped transformer to convert the complete AC signal into DC signal. The main advantage of a center tapped full wave rectifier is that it allows electric current during both positive and negative half cycles of the input AC signal.

Higher power circuit activity may shift a characteristic curve so that diode operating points are different

The dc current through each diode in a bridge rectifier equals to the load current.

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