InterviewSolution
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InterviewSolution
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(a) What is the heating effect of electric current ?(b) Write an expression for the amount of heat produced in a resistor when an electric current is passed through it stating the meanings of the symbols used.(c) Name two appliances based on heating effect of electric current. |
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Answer» (a) When an electric current passes through a conductor (like a high resistance wire) the conductor becomes hot after some time and produces heat. This is called heating effect of Electric Current. Ex: A bulb becomes hot after its use for some time. This is because of heating effect of electric current. (b) We Know that H = P x t H = \(\frac{Energy }{Time}\times t\) \(\because\) Energy = V.Q H = \(\frac{V.Q.t}{t}\) H = Vit \(\because\) V = IR H = I2Rt Other form \(H = V\left[\frac VR\right]t\) \(H = \frac{V^2}{R}t\) Where I = Current R = Resistance t = Time (c) Two devices which work on the heating effect of electric current are: (i) Electric heater (ii) Electric iron |
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