Question: Finding Current in Series Circuit with Household Appliances

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SUMMARY

The discussion centers on calculating the current in a 115 V household circuit with a 1385 W hair dryer and a 625 W microwave oven. When both appliances operate simultaneously, the current is 17.48 A. However, when connected in series, the current draw is not straightforward due to the nature of AC appliances, which typically should not be connected in series. Participants emphasize the importance of understanding resistance and power calculations, noting that the microwave would likely not operate in such a configuration.

PREREQUISITES
  • Understanding of Ohm's Law (V=IR)
  • Knowledge of power calculations (P=IV)
  • Familiarity with household electrical systems (115 V AC)
  • Concept of resistance in electrical circuits
NEXT STEPS
  • Research the implications of connecting AC appliances in series
  • Learn about calculating total resistance in series circuits
  • Study the effects of power ratings on current draw in household circuits
  • Explore safety standards for household electrical systems
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Students studying physics, electricians, and anyone interested in understanding household electrical systems and appliance interactions.

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Homework Statement


What current would flow in an ordinary 115 V household circuit, if a 1385 W hair drier and a 625 W microwave oven were operating simultaneously on this line?
Answer: 17.48 A

How much current would the hair drier and microwave from the previous question draw, if they were connected to the 115 V line in series?
Answer: Unknown

Homework Equations


P=IV, V=IR


The Attempt at a Solution


I'm looking for an answer to the second question. Aren't the first and second questions the same? I can't see the difference...
 
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What a dumb question!
What they want you do is calculate the restance of them assuming the powers given above, then calculate the series resitance and use that with 115v to get a power.
 
thanks, but you don't have to be so mean! sheesh! We all make stupid mistakes
 
I think he was referring the question in your text, not your question about the question.
 
Sorry I meant it was a stupid question in the book - you don't connect 115V ac appliances like that. I would have been tempted to say 0A because the microwave wouldn't turn on!

It's the sort of thing that puts people off physics - they think it's all just trick questions, when you are supposed to ignore friction here or assume the weight of the rope doesn't matter there.
 
Last edited:

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