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You have 2 electric lamps having rating 40W; 220V and 60W ; 220V. Which of the two has a higher resistance? Give reasons for your answer. If these two lamps are connected to a source of 220V, which will glow brighter? |
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Answer» Answer: 40w,220w Explanation: Power is INVERSELY PROPORTIONAL to RESISTANCE. therefore, LESSER the power, more is the resistance. so, electric lamp having 40W ,220V has higher risistance. P=V SQUARE/R 40=48400/R 48400/40=R R=1210 OHM P=V square /R R=48400/60 R=806.6 OHM Therefore,electric lamp having 40W, 220V has a higher resistance. |
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