If three cells of emfs 2 v, 3 v, 4 v are connected in parallel, then the effective
emf is
Answers
Explanation:
Strange kind of situation, never come across in my life.
In theory, for purposes of this discussion, if the 4 volt cell has an infinite supply capacity, the effective output from this combination will be 4 volts.
Current, will, besides flowing into the rest of the circuit, also flow into the 2 V and 3 V cells from the 4 volt cell, in with an effective voltage of 2 (4–2) and 1 (4–3) volts respectively, divided by their ‘backward’ internal resistances. But that’s not relevant to the question.
The simple theoretically correct answer, is that the effective EMF will be 4 volts.
Unlike other components like resistors, caps or inductors, the voltages will neither add up (eg Vtot = V1 + V2 + V3, therefore 2+3+4 = 9, is wrong), nor follow the reciprocal law (eg Vtot = reciprocal of the sum of the reciprocals of V1, V2 and V3 is also wrong). That would be the take home message here.
Better still, don’t connect cells or any voltage sources this way!