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Presentation transcript:

Power

Power P = work/time (J/s) or (Watt) P = I* V The “Power” company charges you by the Kilowatt Hour or Kwhr. What unit are they really charging?

If you left a 60Watt light bulb on continuously for 30 days how much would it cost you?

What would happen if you plugged a 30watt light bulb from your car (12V) into a socket in your house (120V)?

Questions Why are Christmas lights wired is series? If high voltage is dangerous why does the power company transport electricity at such high voltages? Why is your car 12V and your house 120V? Is your house wired in series or in parallel? Why? Why is it bad to rate light bulbs by Watts?