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There are 10 identical bubls conneted in series across a battery. The rate at which electric energy is consumed is x. Now when only 8 bubls are connected across the same supply then what will be the effect of electric energy consumed? |
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Answer» Solution :Let R be the resistance of each bulb then power consumption `(P = V^( 2)//R)` can be written as follows: `x= (V^(2))/(10R)` ..(i) Note that total resistance of BULBS is 10R. Now when 8 bulbs are connected then the overall voltage is same but resistance has decreased to 8R. Hence, power consumption BECOMES as follows: `P = (V^(2))/(8R) = (10X)/(8)` Hence power consumption increases to 1.25 times the original amount. |
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