Question

A parallel combination of following cells is connected to an external load.If all the cells are connected in same polarity then the value of resistance of the external load such that the power transfer to the load is maximum​

Answer 1

Answer:

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Answer 2

Concept:

• When the external resistance has the same value as the net internal resistance of cells, the power transfer to the load will be maximum
• The parallel combination of cells

Given:

• The internal resistance of cell 1 r1 = 4 ohm
• The internal resistance of cell 2 r2 = 4 ohm
• The internal resistance of cell 3 r3 = 2 ohm

Find:

• The value of resistance of the external load is such that there is a maximum power transfer

Solution:

The equivalent internal resistance of cells which are connected in parallel.

1/R = 1/r1+ 1/r2+ 1/r3

1/R = 1/4 +1/4 + 1/2

1/R = 1/2+ 1/2 = 1

R = 1/1

R = 1 ohm

The value of resistance of the external load is 1 ohm.

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