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EMF Problem

  • Thread starter kriegera
  • Start date
  • #1
74
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Homework Statement


A current of 22 amperes flows in a heater coil whose resistance is 5 ohms. What E M F in volts is required?


Homework Equations





The Attempt at a Solution


Not quite sure where to begin. I'm thinking the internal resistance, R, is inherent w/the circuit so EMF must be greater than the velocity calculated.

Velocity =IXR=22x5=110
EMF=V +IR = 110 + 22x5=220 volts
Any comments here on if this is correct?
 

Answers and Replies

  • #2
Just V=IR
Review your variables before you plug and chug. V here is not velocity, it is the EMF.
 
  • #3
74
0
Just V=IR
Review your variables before you plug and chug. V here is not velocity, it is the EMF.
So this would be ohm's law?
V=IR -->
EMF=(22)(5)=110 Ohms
 
  • #4
Yeah, should be. Except the units of EMF is in volts. Resitance is ohms.
 

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