How does a dimmer switch for a light work?
Most dimmer switches will work with turning it to the left will make it darker and to the right will make it brighter. If you want it on or off you just push in the switch.
Control on their on-off switch. This method wasted electricity and generated a lot of heat. Amount of energy going to the light the rheostat had to throw a lot away, turning it into heat.
Example, at half brightness a 100 watt bulb would waste about 20 watts to heat in the rheostat. Modern dimmer switches work an entirely different way. A TRIAC to switch the electricity on and off very rapidly--120 times each second.
Shown in the figure. Negative or, half the time it's flowing one way and half the other.
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