Download Electric Force - Parkland College

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?