anonymous
  • anonymous
An electric clothes dryer draws 18 A from a 240-V wall outlet How much power in watts does it use?
Physics
katieb
  • katieb
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anonymous
  • anonymous
W = A x V.... so 4320?
JamesJ
  • JamesJ
Power is the rate of change of work. The amount of work moving a charge C over a potential difference V is W = VC Now the rate of change of work where V is constant is \[ Power = P = V \frac{\Delta C}{\Delta t} = V I \] where \( I \) is current. By definition current is the rate at which charge moves. Hence to find the power of this circuit, calculate \[ P = VI \]
anonymous
  • anonymous
so 4320?

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anonymous
  • anonymous
or convert to watts?!?
JamesJ
  • JamesJ
4,320 Watts, yes.
anonymous
  • anonymous
oh ok
JamesJ
  • JamesJ
Watt = Joule/sec hence it must be that VC has units Joules. Its a good exercise to understand why that is the case.
anonymous
  • anonymous
ahh what about, "In a __________ circuit, the voltage across all resistors is the same."
radar
  • radar
Parallel

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