Q1 of 9 Page 138

Draw the method of connecting four resistors of 2 Ω each to get .

No possible Method

Since we have 4 resistors of 2Ω each; so maximum resistance that we can get is 8Ω and minimum is 2Ω. So, our first thought would be that we can solve the above problem.


And we try 1 resistor in series with other 3 in parallel and we don’t get the above-given resistance. On trying other possible combination, we don’t get; hence the above problem is not correct and there is no a possible method.


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5

A potential difference of 6 V is applied across a conductor having 12 Ω resistance. How much current will pass through it?

How many times will the current increase if length of the resistor is halved and potential difference is doubled?

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What mode of connection of three resistors of 3 Ω each will produce minimum resistance? What will produce maximum resistance? Draw the diagram and calculate the effective resistance.

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The figure shows a conductor of resistance 8 Ω connected in a circuit in the circular shape.


Of these, which gives minimum resistance? Justify your answer.

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Construct a pencil rheostat as shown in the figure. Arrange a science corner to exhibit a model using this to show the factors affecting the resistance of a conductor and to explain Ohm’s Law.


Make a channel on the sole of a slipper so as to place three cells. Remove the wooden insulation from half the pencil length wise so that the graphite can be seen. Fix a bulb holder and the pencil on the sole using glue. Then arrange clips, safety pin, cells and bulb as shown in the figure.