Dyal Singh Public School Dyal Singh Colony, Karnal
Class – 10th
Physics Assignment (Electricity)
1. On what factors does the resistance of a conductor depend?
2. How much work is done in moving a charge of 2 C across two points having a potential difference 12 V?
3. A current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes. Find the amount
of electric charge that flows through the circuit.Calculate the number of electrons in 1 coulomb of charge.
4. Name a device used to maintain potential difference across a conductor.
5. An electric lamp, whose resistance is 20 Ω, and a conductor of 4 Ω resistance are
connected
to a 6 V battery. Calculate
(a) the total resistance of a circuit
(b) the current through the circuit, and
(c) the potential difference across the electric lamp and conductor.
6. Why are coils of electric toasters and irons made of an alloy rather than of a pure metal?
7. The potential difference between the terminals of an electric heater is 60 V when it draws a
current of 4 A from the source. What current will the heater draw if the potential difference
is increased to 120 V?
8. Will current flow more easily through a thick wire or a thin wire of the same material, when it is connected to the same source? Why?
9. Give two examples for applications of heating effect of electric current.
10. A wire of resistance 10Ω is bent in the form of a closed circle. What is the effective resistance between the two points at the ends of any diameter of the circle?
