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Calculating POWER and Electrical COST

Calculating POWER and Electrical COST. ELECTRICAL POWER. Rate at which energy is consumed or produced Changed into other forms of energy Measured in WATTS (W). Calculations. Formula is P=IV Power=Current x Voltage. P. Units: Power: watts Voltage: volts Current: amps. V. I.

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Calculating POWER and Electrical COST

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  1. Calculating POWER and Electrical COST

  2. ELECTRICAL POWER • Rate at which energy is consumed or produced • Changed into other forms of energy • Measured in WATTS (W)

  3. Calculations • Formula is P=IV • Power=Current x Voltage P Units: Power: watts Voltage: volts Current: amps V I

  4. Electrical Energy • Depends on POWER (kW) and TIME (h) • Units are kWh • The amount of electrical energy used in a home depends on the power of the electrical devices in the house and the length of time that those devices are on

  5. Calculating Electrical Energy and Cost • Example: A coffee pot operates on 2 amperes of current on a 110-volt circuit for 3 hours. Calculate the total kWh used. • Step 1: Determine Power (P=VI) • P = 110 Volts x 2 amps • P= 220 watts • Step 2: convert watts to kilowatts • 220 watts/1000 = 0.22 kW • Step 3: Multiply by the hours given in the problem • 0.22 kW x 3 hrs = 0.66 kWh

  6. Calculating Electrical Energy and Cost • What is the cost of using the coffee pot if the cost of energy is $0.15 per kWh? • Step 1: Multiply the kWh by the cost • 0.66 kWh x 0.15 = $0.099

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