Q5 of 41 Page 221

How is a voltmeter connected in the circuit to measure the potential difference between two points ?

The volt meter is always connected in parallel connection across the two points where the potential difference is to be measured in the circuit.


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3

An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be:

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Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then in parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combination would be:

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A copper wire has diameter 0.5 mm and resistivity of 1.6 x 10-8 m. What will be the length of this wire to make its resistance 10? How much does the resistance change if the diameter is doubled?

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The values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given below:

I (amperes): 0.5 1.0 2.0 3.0 4.0


V (volts): 1.6 3.4 6.7 10. 2 13.2


Plot a graph between V and I plotted by using the given data is shown below: