If you dim light does it consume less electricity?
It depends on the dimmer.
Old dimmers worked by being a variable resistor (a rotary rheostat). Those dimmers and light bulb combos will always consume the same amount of power because the dimmer dims the light by using up more or less power themselves (by being more or less resistive). In other words, if you dimmed the light, the dimmer itself would get hotter because that energy that didn't get sent to the light bulb was turned into heat instead.
If you had a 60-watt light bulb and dimmed it down to 50%, the dimmer would use 30 watts of power and produce 30 watts of heat.
Modern dimmers work by essentially turning the circuit on and off very rapidly. As a result, it ends up consuming less energy.
Unless you happen to have a very old dimmer, dimming your light do end up consuming less power.
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