The TRIAC based AC voltage controller  operates in phase control mode. The regulator is used to control heat of a welding coil. The supply voltage is 230V, 50Hz and heating element has a resistance of 20Ω. If the TRIAC is fired at an angle of 500 , compute the rms value of the output voltage, rms value of the output current and power delivered to the load.

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.