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How many 40W,220V lamps can be safety connected to a 220V, 5A line? Justify your answer. |
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Answer» Solution :The current DRAWN by a 40W,220V ELECTRIC LAMP `I_1=P_1/V=40/220=2/11 A` As the electric line is of rating 220V, 5A hence we can connect n lamps in parallel where `n=I/I_1=5/((2/11))=(5 times 11)/2=27.5` THUS, we can safety connect 27 lamps of 40W,220V rating to a 220V,5A line. |
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