How to Calculate Watts

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Watch more Intermediate Math Skills videos: http://www.howcast.com/videos/437615-... • The amount of power drawn by a household appliance is given in watts. Here's how to calculate wattage. • Step 1: Understand the definition • Know that 1 watt is the amount of power produced by a current of 1 ampere across a potential difference of 1 volt. • Tip • Equivalently 1 watt is the amount of work done at the rate of one joule per second. • Step 2: Understand appliances • Understand that the wattage listed on an appliance is the maximum power it draws. Because many appliances have a range of settings, the actual amount of power consumed at any given time depends on the setting used. • Step 3: Use a formula • Consider using a formula to estimate wattage. To do this you will need to know the current draw, the voltage used by the appliance, and/or the resistance of the appliance. • Step 4: Use voltage and current • Calculate the wattage from the product of voltage and the current for the appliance. Voltage is measured in volts and current in amperes (or amps). • Tip • If an appliance is rated at 5 amps and 120 volts, the wattage is 600 watts (5 amps times 120 volts, which equals 600 watts). • Step 5: Use current and resistance • Obtain the wattage as the product of the square of current times the resistance. Resistance is measured in ohms. • Step 6: Use voltage and resistance • Calculate the wattage from the quotient of the square of voltage divided by resistance. • Did You Know? • James Watt was an 18th-century mechanical engineer who made important contributions to improvements of the steam engine.

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