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# Electric power

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### Electric power

1. 1. Agenda Bell Work• Notes: Electric Power• Calculations • What is the difference between a series and a parallel circuit?• Household Energy Use – • When more devises (light Gizmo bulbs) are added to each, what happens to:• HW: Chp 12 pg 192-195, – Voltage 204 – Currant – resistance• Test Friday
2. 2. November 26, 2012
3. 3. 1. Explain how moving electrons can do work2. Calculate Power given two variables
4. 4.  Moving charges can do work – heat a circuit or turn a motor Power is the rate of using energy
5. 5.  Electrical energy may be transformed to:  Mechanical energy (a motor)  Light (a lamp)  Thermal energy (a heater)  or other forms
6. 6.  Power = current x voltage Units  Watts = amperes x volts What power is needed to operate a clock radio if it draws a current of 0.05 amps from your household circuit?
7. 7.  Electrical Energy is supplied to our houses by generators and motors This energy is purchased from power company’s The electrical energy travels through power lines to individual homes to be sold to the homeowner
8. 8.  The units of energy sold is represented in units of 1000 watts delivered for one hour, or units called kilowatt-hours. 1 kilowatt = 1000 watts 1 kilowatt-hour = 1000 watts delivered for 1 hour The more electrical power a consumer demands, the more kilowatts are used
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