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anonymous

  • 4 years ago

An electric clothes dryer draws 18 A from a 240-V wall outlet How much power in watts does it use?

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  1. anonymous
    • 4 years ago
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    W = A x V.... so 4320?

  2. JamesJ
    • 4 years ago
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    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 \[ P = VI \]

  3. anonymous
    • 4 years ago
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    so 4320?

  4. anonymous
    • 4 years ago
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    or convert to watts?!?

  5. JamesJ
    • 4 years ago
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    4,320 Watts, yes.

  6. anonymous
    • 4 years ago
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    oh ok

  7. JamesJ
    • 4 years ago
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    Watt = Joule/sec hence it must be that VC has units Joules. Its a good exercise to understand why that is the case.

  8. anonymous
    • 4 years ago
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    ahh what about, "In a __________ circuit, the voltage across all resistors is the same."

  9. radar
    • 4 years ago
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    Parallel

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