A bulb is rated 100 W, 220 v and an electric heater is marked 2000 W ,220 v.What is the ratio between the resistances of a bulb to heater
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In the case of heater current = w/v = 2000/220 = 9.09A. Hence power-voltage rating help us in this case. The current through the bulb is only 0.45A while through the heater it is 9.09A.
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