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Electric Power

A cell of emf...

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A cell of emf E and internal resistance r is connected across a variable load resistor R draw the plots of terminals voltage V vs (1)R (2)the current I

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Q. A cell of emf 'E' and internal resistance r is connected across a variable resistor 'R'. Plot a graph showing variation of terminal voltage 'V' of the cell versus the current 'I'. Using the plot, show how the emf of the cell and its internal resistance can be determined.

Q. A cell of emf 'E' and internal resistance 'r' is connected across a variable load resistor R. Draw the plots of the terminal voltage V versus (i) R and (ii) the current i.
It is found that when

R = 4 Ω

, the current is

1 A

when R is increased to

9 Ω

, the current reduces to

0.5 A

. Find the values of the emf E and internal resistance r

Q. A cell of emf 'E' and internal resistance 'r' is connected across a variable load resistor R. Draw the plots of the terminal voltage V versus (i) R and (ii) the current I.
It is found that When

R = 4 Ω

, the current is 1 A and when R is increased to

9 Ω

, the current reduces to 0.5 A. Find the values of the emf E and internal resistance r.

Q. A generator has an emf of

440 v o l t s

and internal resistance of

400 o h m s

. Its terminals are connected to a load of

4000 Ω

. The voltage across the load is nearly

Q. A resistor of

10 Ω

connected across a cell of emf 12 V, draws the current of 1.1 A. Find the internal resistance of the cell.

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