Power, Voltage and Current - Hairdryer Problem

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Homework Statement


A typical household circuit is capable of carrying 30.0 A of current at 120 V before the circuit breaker will trip. How many 1500-W hair dryers can run off one such circuit?

Use the relation between power, current and voltage. Also, remember hair dryers come in integer units.

Homework Equations


P = VI


The Attempt at a Solution


P = 120 * 30 = 3600
3600/1500 = 2.4

This is incorrect and I don't understand why. Am I missing something?
 

Answers and Replies

  • #2
vela
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What's 0.4 of a hairdryer?
 
  • #3
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Ah, thank you. I only put 2.4 because they said "Also, remember hair dryers come in integer units" so I thought they wanted the .4.

Thank you!
 

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