3.9. 10C charge is transferred in a certain time to result in a current of 2.5A. What is the time in ms? A. 4ms B. 4000ms C. 0.25ms D. 250ms 3.10. A 100W light bulb burns for 10 hours a day for a week. The weekly consumption of energy will be A. 7000kWh B. 7kWh C. 0.007kWh D. 7Wh 30002 ww www 5000 20092 ww 10002 Figure 1 3.11. Irrespective of the battery voltage in Figure 1, above, the smallest current will flow in the resistance. Α. 5000 Β. 3000 C. 2000 D. 1000 3.12. Choose the correct statement. A. Resistivity is a constant for a material relating the current through it and the voltage across it. B. Resistivity of a material is directly proportional to the temperature of that material. C. One of Kirchhoff's laws states that the sum of the currents in a closed loop is equal to zero. D. Resistances of coils can be identified by a code system. 3.13. An electric kettle is required to heat 600ml of water from 10°C to boiling point in 5 min, the supply voltage being 240V. The efficiency of the kettle is 87%. Assume the specific heat capacity of water to be 4190J/kg.K and 1 litre of water to have a mass of 1kg. The resistance of the heating element is Α. 63.4Ω B. 59.50 C. 56.50 D. 66.49 3.14. A battery with e.m.f of 12.48V has an internal of 0.802. What will be the terminal voltage when connected to a 2002 load? A. 12.48V B. 12V C. 12.24V D. 20V 3.15. A coil of 8 resistance is in parallel with a coil of 2002 resistance. This combination is connected in series with a third coil of 12 resistance. If the whole circuit is connected across a battery, having an e.m.f. of 30V and an internal resistance of 202, what is the terminal voltage of the battery? A. 26.96V B. 27.55V C. 26.32V D. 26.57V 4 [15]

3.9. 10C charge is transferred in a certain time to result in a current of 2.5A. What is the time in ms? A. 4ms B. 4000ms C. 0.25ms D. 250ms 3.10. A 100W light bulb burns for 10 hours a day for a week. The weekly consumption of energy will be A. 7000kWh B. 7kWh C. 0.007kWh D. 7Wh 30002 ww www 5000 20092 ww 10002 Figure 1 3.11. Irrespective of the battery voltage in Figure 1, above, the smallest current will flow in the resistance. Α. 5000 Β. 3000 C. 2000 D. 1000 3.12. Choose the correct statement. A. Resistivity is a constant for a material relating the current through it and the voltage across it. B. Resistivity of a material is directly proportional to the temperature of that material. C. One of Kirchhoff's laws states that the sum of the currents in a closed loop is equal to zero. D. Resistances of coils can be identified by a code system. 3.13. An electric kettle is required to heat 600ml of water from 10°C to boiling point in 5 min, the supply voltage being 240V. The efficiency of the kettle is 87%. Assume the specific heat capacity of water to be 4190J/kg.K and 1 litre of water to have a mass of 1kg. The resistance of the heating element is Α. 63.4Ω B. 59.50 C. 56.50 D. 66.49 3.14. A battery with e.m.f of 12.48V has an internal of 0.802. What will be the terminal voltage when connected to a 2002 load? A. 12.48V B. 12V C. 12.24V D. 20V 3.15. A coil of 8 resistance is in parallel with a coil of 2002 resistance. This combination is connected in series with a third coil of 12 resistance. If the whole circuit is connected across a battery, having an e.m.f. of 30V and an internal resistance of 202, what is the terminal voltage of the battery? A. 26.96V B. 27.55V C. 26.32V D. 26.57V 4 [15]