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Question Bank Electric Energy, Power and Household Circuits 1. (a) What do you understand by the term electric work ? (b) State the SI unit of electric work and define it. (c) Name two bigger units of electric work. How are these units related to the SI unit of electric work ? Ans. (a) Electric work is said to be done, when a charge flows through a conductor at some potential difference. (b) The SI unit of electric work is joule. When a current of 1A flows through a conductor at a p.d. of 1 volt for one second, the electric work is said to be 1 joule. (c) (i) Kilojoule = 103 joules, (ii) megajoule = 106 joules. 2. State expressions for electric work connecting : (i) Current, resistance and time. (ii) Current, potential difference and time. (iii) Potential difference, resistance and time. Ans. (i) W = I2.Rt. (ii) W = IVt. V 2t (iii) W = . R Class-X 1 Question Bank
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