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(d) Both(A) and (R) are correct but (R) is the correct explanation of (A)., , SHORT ANSWER TYPE QUESTIONS (3 Marks), , . Finda relationship between P, I and V., , State Ohm’s law. Derive relation between I, V and R. Draw the graph between, Vand I., . What is Joule’s heating effect of current P ? Derive its expression., , . What would be new resistance if length of conductor is doubled and thickness is, halved ?, , . Find the effective resistance between A and B., , [Science Class - 10, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , 19 19, 19 10 19, 1 10 5, 30 30., a [7B, 30 30,, 20, A, 20 20, 20, B, , Which is the better way to connect lights and other appliances in domestic, wiring and why ?, , Show how would you join three resistors, each of resistance 9 Q so that the, equivalent resistance of the combination is (i) 13.5 Q, (ii) 6 Q?, , (a) Write Joule's law of heating. (b) Two lamps, one rated 100 W; 220 V, and, the other 60 W; 220 V, are connected in parallel to electric mains supply. Find, the current drawn by two bulbs from the line, if the supply voltage is 220 V., , (a) List the factors on which the resistance of a conductor in the shape of a, wire depends. (b) Why are metals good conductors of electricity whereas, glass is a bad conductor of electricity? Give reason. (c) Why are alloys, , commonly used in electrical heating devices? Givereason. | (CBSE2018), , Science Class-10