Answer Posted / raseelrasheed
example,if water is flowing from bottom(bottom) to tank
(top) with help of pumpset,we know that water cannt flow to
top without help of ext. power.here the functions are
comparison
WATER-workdone--electrone
PUMP -force--battery(voltage source)
TANK -load---bulb
so the functions of voltage is supply power for dead
electrone to climb valance region and to blow the bulb
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