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Objective 16.02

Objective 16.02. Compute electrical energy and cost. 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.

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Objective 16.02

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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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