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Electrical Energy and Cost Calculation Guide

Learn how to compute electrical energy usage and cost using formulas for watts, volts, amps, and Ohm's Law. Calculate wattage, voltage, amperage, and electricity costs effortlessly.

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Electrical Energy and Cost Calculation Guide

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  1. Objective 16.02 • Compute electrical energy and cost

  2. Formulas to compute electrical energy and cost • Watts = volts x amps • W=VA • How many watts of electricity will a 7.5 amperes electric motor use in 5 hours on a 120 volt circuit? • W=VAT • W=(120)(7.5)(5) • W=4500 watts

  3. Formulas to compute electrical energy and cost • Volts = watts / amps. • V = W/A • What volt circuit is needed for a 7.5 amp electric motor that uses 900 watts in 1 hour? • V = 900/7.5 (1) • V = 120

  4. Formulas to compute electrical energy and cost • Amps equal watts divided by volts • A = W/V • What should the amp rating of an electric motor be if it uses 900 watts of electricity in 1 hour in a 120 volt circuit? • A = 900/120 (1) • A = 7.5 amps

  5. Formulas to compute electrical energy and cost • Ohms Law • I = E/R • I = amps • E = volts • R = resistance

  6. Cost of electricity • Cost of electricity = cost/kwh x number of kw x hours of use • If electricity costs 12 cents/kwh, how much would it cost to use 2 kw/hr for 10 hours? • .12x2x10 = $2.40

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