Electrical Power & Efficiency.  I will be able to calculate cost to operate and percent efficiency of various devices.

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Presentation transcript:

Electrical Power & Efficiency

 I will be able to calculate cost to operate and percent efficiency of various devices.

 Electrical Power: The rate at which electrical energy is produced or used.  Measured in Watts (W). Equivalent to 1 Joule / sec. (1 J/S)  Power at your home is measured kilowatt hours (kWh). Use of 1000W of power for one hour.

cost to operate = power used x time x cost of electricity  Power used  kW (1kW = 1000W)  Time  hours

 What is the cost of running a 60W light bulb constantly for 5 hours if it costs $0.161/kWh?

 How much does it cost to operate a 1500W hair dryer to dry your hair 10 minutes a day for 3 days if the cost of electricity is $0.151 / kWh

 Efficiency: Comparison of the energy output of a device with the energy supplied.  Certain devices are more energy efficient than others.  How to tell? Look for EnerGuide label on the device (Canada) Look for energy star label on the device (USA)

 To calculate the efficiency of a device we use the percent efficiency formula: Where: E OUT is the useful energy output E IN is the amount of energy needed.

 A lightbulb requires 150J of energy to produce 125J of light energy. Calculate the percent efficiency of the lightbulb.

 A ceiling fan requires 1800J of energy to produce 1345J of output in the form of spinning blades. How efficient is the fan?

 I will be able to calculate cost to operate and percent efficiency of various devices.

 worksheet!!