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In our homes, we receive the supply of electric power through a main supply also called mains, either supported through overhead electric poles or by underground cables. In our country the potential difference between the two wires (live wire and neutral wire) of this supply is 220 V.
Earthing wire in domestic electric circuits is a safety measure. Justify this statement explaining its role in case of accidental leakage of electric appliances.
Define electric power. Derive the expression P = I²R and P = V²/R. An electric iron consumes 1000 W when operated at 220 V. Calculate the current and the resistance of the iron. Also, State two safety precautions to be taken while handling electrical appliances.
With the help of a ray diagram, explain the formation of an image by a convex lens when the object is placed — (a) at infinity, (b) between F and 2F, (c) at F. State the nature, position, and size of each image.
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