Q43 of 72 Page 12

The value 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 (volt) 0.5 2.5 6.75 11.0 15.0.

Since V is an independent variable it is taken along x-axis. The dependent I variable is taken along y-axis.
Resistance of the resistor R = = = 3.22 Ω.

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41 A 40 watt lamp requires 0.182 A of current at 220 volts, while a 60 watt lamp requires 0.272 A of current at 220 volts. If a 40 watt lamp and a 60 watt lamp are connected in series with a 220 volt line, how many amperes of current will flow through each lamp? 42 Five dry cells each of 1.5 volt have internal resistance of 0.2, 0.3, 0.4, 0.5 and 12 ohms. When connected in series, what current will leave these five cells furnish through 10 ohm resistance? 44 Calculate the resistance of one metre of copper wire that has a cross–sectional area of about 2 x 10-2 cm2 (using the value of resistivity of copper to be 1.2 × 10-8 ohm m) Compare the value of this resistance with that of a flashlight bulb, which has a power rating of 1 W and operates at 3 V. What does this comparison tell you ? 1

Calculate the work done in moving a charge of 5 coulombs from a point at 20 to another at 30 V.