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Question 1 of 10
1. Question
1 point(s)When a 5Ω resistor is connected to the terminal of a cell, the current in the resistor is 5A. When the resistor is replaced by another resistor with resistance 30Ω, the current becomes 1A. Find the internal resistance of the cell
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Question 2 of 10
2. Question
1 point(s)
An experiment was carried out to determine the e.m.f. and the internal resistance of a dry cell. The result was plotted on a graph as shown in the diagram below. Find the internal resistance of the cell.
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Question 3 of 10
3. Question
1 point(s)
An experiment was carried out to determine the e.m.f. and the internal resistance of a dry cell. The result was plotted on a graph as shown in the diagram below. What is the e.m.f of the cell?
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Question 4 of 10
4. Question
1 point(s)A current of 0.50A flows through a 100 Ω resistor. Find the power dissipated from the resistor?
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Question 5 of 10
5. Question
1 point(s)A bulb rated 240 V, 18 W is operated from a 240V power source. Find the current flowing through the bulb.
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Question 6 of 10
6. Question
1 point(s)3 light bulbs of resistance 1Ω, 2Ω and 3Ω are connected in series to a power source of 240V. Find the power of the light bulb of resistance 2Ω.
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Question 7 of 10
7. Question
1 point(s)
The figure above shows that an ideal battery is connected in parallel to two resistors with resistance 2 Ω and 4 Ω. Find the power dissipated in the 2 Ω resistor.
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Question 8 of 10
8. Question
1 point(s)A 2000W heater is used to heat 500 cm3 of water. Find the minimum time needed to heat the water from 25 to 100 °C. (Specific Heat Capacity of water = 4200Jkg-1oC-1)
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Question 9 of 10
9. Question
1 point(s)An electric heater of power 3600W is used to heat water for 15 minutes. If the cost of 1 unit (kilowatt-hour) energy consumption is 24 cent, what is the cost of this heating process?
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Question 10 of 10
10. Question
1 point(s)An electric motor raises a mass of 20kg to a height of 5m in 10s. Given that the electric motor is connected to a power source of 80V and current 2A. Find the efficiency of the motor.
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