V^2/R.t or I^2Rt ?

Asked by patric_9432 | 2nd Feb, 2010, 07:30: PM

Expert Answer:

Dear student,

As current flows through a resistor, the resistor heats up. The heat in joules is given by:

H = I2 Rt = Pt

where t is the time in seconds. In other words, a resistor heats up more when there is a high current running through a strong resistor over a long stretch of time.

Substituting V/R in I, we get the other equation. Both equations are one and the same.

Hope this helps.



Answered by  | 2nd Feb, 2010, 08:07: PM

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