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A watt is a unit of energy per second. A typical handheld hair dryer uses about 300 to 1800 watts. If you use an 1800-watt dryer for an hour, you will have used 1800 watt-hours, or 1.8 kilowatt-hours.
Wiki User
∙ 11y ago
Wiki User
∙ 13y agoMost hair dryers "burn" electrical energy at a rate of about 1500 Watts. The heaters in the hair dryer use most of the energy; the fan, less so.
The Watt is a unit of power, by definition one Joule (energy) expended each second of time. So a hair dryer uses 1500 Joules of energy every second. A Joule is similar to a calorie, a specific amount of energy. They had to call it something, so they named it a Joule.
In electricity, Power equals Current times Voltage, or P = I * V
If your hair dryer is like most, it runs on a 120 Volt supply line.
Using algebra, solving P=IV for current (I), then I = P/V
I = 1500 Watts divided by 120 Volts = (1500/120) = 12.5 Amperes
Hair dryers use 1500 W, at a potential of 120 V, drawing a current of 12.5 A
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