a) Write a mathematical expression for Joule's law of heating. Name on this principle. a device which work (b) An electric iron of resistance 20 Q takes a current of 5 A. Calculate the heat prod (c) The current through the above resistor is made three times its initial value. in 30 seconds. Calculate the change in heat produced. 11
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The heat that is generated because of the current flow in an electric wire is described in Joules. Q = I2 R t. ... R is the amount of electric resistance in the conductor. t denotes time.
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