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WORKSHEET 2(CURRENT ELECTRICITY)(RESISTORS AND CELLS)


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         4)                A cell of emf E and resistance r is connected across an external resistance R. the potential
                           difference across the terminals of a cell for r =R is _______________.


         5)                The sequence of bands marked on a carbon resistor is brown,black,brown,gold. The value of
                           the resistance is ___________________

         6)                In slide wire bridge experiment, copper strips are used in place of copper wires, due to their
                           low _______________.

                                  7)   A cell of emf E and internal resistance r is connected across a variable resistor R .Plot a graph
                           showing the variation of terminal potential difference V with resistance R. Predict from the
                           graph the condition under which V=E.

                                 8)   An electric current is passed through a circuit containing two wires of the same material
                           connected in parallel. If the length and radii of the wires are in the ratio 2/3 and 4/3 ,then find
                           the ratio of currents passing through the wires.

                                 9)   A battery of emf E and internal resistance r sends current I 1 and I 2 ,when connected to external
                           resistances R 1 and R 2 respectively. Find the emf and internal resistance of the battery.

                                10)   Calculate the current drawn from the battery by the network of resistors shown in the figure.
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