The heat produced by a current I in the wire of resistance R during time interval t is:
Correct answer: B. I2Rt
- A. I2/Rt
- B. I2Rt
- C. I2/R/t
- D. IR2t
Explanation
Work done when an electric charge Q moves against a potential difference is given by,W=QxVSince current is I=Q/tQ=IxtBy ohm's law, V/I=RV=IxRBy combining the equations we achieve,W=I x t x I x RW= I2RtWe assume that all electrical work done is converted into heat energy we can predict,Heat produced, H=I2Rt joules
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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