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

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Homework Help Overview

The problem involves calculating the electromotive force (EMF) required for a heater coil with a specified current and resistance. The subject area pertains to electrical circuits and Ohm's law.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • The original poster attempts to apply Ohm's law but expresses uncertainty about the initial approach and the interpretation of variables. Some participants question the use of the term "velocity" in the context of the problem, suggesting a need for clarity in variable definitions.

Discussion Status

Participants are engaged in clarifying the correct application of Ohm's law and the definitions of the variables involved. There is an ongoing exploration of the relationship between current, resistance, and EMF, with some guidance provided on the correct interpretation of the variables.

Contextual Notes

There appears to be confusion regarding the terminology used, particularly the reference to "velocity" instead of voltage. This may affect the understanding of the problem setup.

kriegera
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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?
 
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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.
 

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