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Assignment: PHYSICS
F A -1
1. Write least possible resistance and maximum possible resistance that can be obtained using the
following three resistors: 2 ohm, 3 ohm , 5 ohm?
2. an electric wire is stretched to increase its length by 25%. By what percentage the resistance will
increase and what will be the increase in its resistivity?
3. Draw a schematic diagram of a circuit containing folloeing electrical components:
A resistance, an electric bulb ,voltmeter cell, ammeter, plug key
4 . Why don’t birds sitting on live wire get electric shock?
5. Why is tungsten metal more coiled in the bulb and not installed in straight wire form?
6. .A wire is 1 meter long ,0.2 mm in diameter and has a resistance of 10 ohm.
Calculate resistivity of this material.
7. Describe an activity with necessary electric drawn to study factors on which the Resistance of a
conducting wire depends?
8. Why can a bulb be not used to verify ohm’s law?
9. An electric room heater is rated at 2 kw. Calculate the cost of using it for 2 hours daily for the month of
September, if ,each unit cost rs. 4.
10. Draw a schematic diagram of a circuit consisting of 24 v battery, 10ohm resistor,5 ohm resistor, 1ohm
resistor , an ammeter and a plug key all connected in series. Calculate the ammeter reading in the
circuit?