Electromotive Force

  • Thread starter caltzx
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  • #1
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Homework Statement



A power supplyused in a lab has an emf of 5000V. However, when a voltmeter of resistance 20kohm is connected to the terminal of the power supply, a reading of only 24V is obtained. Explain this conservation and calculate any necessary quantity.

The Attempt at a Solution



Not really sure where to go with this. I think it has something to do with internal resistance and such but... not really sure. Could someone at least point me in the right direction?

Thank you.
 

Answers and Replies

  • #2
LowlyPion
Homework Helper
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Maybe start by drawing a circuit diagram.

You have a box that nominally has 5000V.

But when you effectively put a 20KΩ load across it, it only reads 25V.

So what you apparently have is some kind of voltage divider.

Perhaps you want to consider some internal resistance?
 

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