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Electricity & its effects
Submitted by: Karmakar Jain (Pune)
Assignment 1
1. State Ohm's law.
2. An
electric bulb is rated at 220 V and 100 W. When it is operated on 110 V, find
the power consumed.
3. What
will be effect on the resistivity of a conductor, if the length of the conductor is made four times?
4. Explain the factors on which resistivity of a conductor depends.
5. Explain the term 'overloading' and 'short circuiting'. How does Fuse help in avoiding electrical hazards?
6. A bulb of 100 W is used daily for 4 hrs., a fan of 60 W is used daily for 10 hours, an A.C. of 1.5 kW for 2 hrs and a tubelight of 40 W daily for 8 hours. Calculate the total monthly energy consumption and the cost of electricity consumed, if rate of electricity is Rs.10 per unit.
8. Give three applications of heating effect of current.
7. Derive the expression of equivalent resistance of three resistances connected in parallels.
8. How will you connect three resistances of 2 ohms, 3 ohms and 6 ohms to get equivalent resistance of 4 ohms. Draw its circuit diagram.
Then find the amount of current flowing through 2 ohm resistor, if the three resistances are connected to a source of 12 volts.
ANSWERS
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