Answer Posted / parija,santosh,roshan

If the two bulb rating is different(i.e 1st bulb 1000W,240V
& 2nd bulb 1000W,180V ) then the power consumed by each
bulb are
1st bulb KWH = 240 * 4.16 * h = (998.4 * h)KWh
2nd bulb KWH = 180 * 5.55 * h = (999 * h)KWh

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