This assignment contain all important questions of chapter current electricity.
1. How does the drift velocity of electrons in a metallic conductor very with increase in temperature ? 2.The metallic conductor is at a temperature θ1 .The temperature of the metallic conductor is increased to θ2 How will the product of its resistivity andconductivitychange? 3. A cell of e.m.f. 2 V and internal resistance 0.1 Ω is connected to a 3.9 Ω external resistance .What will be the p.d. across the terminals of the cell 4.Nichrome and copper wires of the same length and same radius are connected in series .Current I is passed through them .Why does the nichrome wire get heated first ? 5. Sate the condition in witch terminal voltage across a secondary cell is equal to its e.m.f. 6. Two bulbs whose resistances are in the ratio of 1 ; 2, are connected in parallel to a source of constant voltage . What will be the ratio of power dissipation in these? 7. A toaster produces more heat than a light bulb when connected in parallel to the 220 V mains. Which of the two has greater resistance ?