Finding EMF Required for a 22A, 5 Ohm Heater Coil

Join the discussion
Ask a follow-up here, or get your own question answered by working scientists, mathematicians and engineers — people, not an autocomplete.
Real named experts · corrections over time · the nuance an AI answer skips
Sign up Log in
3 replies · 2K views
kriegera
Messages
73
Reaction score
0

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?
 
Physics news on Phys.org
Just V=IR
Review your variables before you plug and chug. V here is not velocity, it is the EMF.
 
porcupine6789 said:
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
 
Yeah, should be. Except the units of EMF is in volts. Resitance is ohms.