Malaysia SPM Form 5 Physics - Electricity

1.1 Electric Charge
1.2 Electric Current
1.3 Potential Difference
1.4 Ohm's Law & Resistance
2.1 Circuit - Resistance
2.2 Circuit - Current
2.3Circuit - Potential Difference
3.1 Electromotive Force (E.M.F.)
4.1 Electrical Energy and Power

Electrical Energy and Power

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1) A current of 0.50A flows through a 100 Ω resistor. Find the power dissipated from the resistor?

Choice 1
200W
Choice 2
50W
Choice 3
25W
Choice 4 20W


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2) A bulb rated 240 V, 18 W is operated from a 240V power source. Find the current flowing through the bulb.

Choice 1
13.3 A
Choice 2
1.0 A
Choice 3
0.125 A
Choice 4 0.075 A



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3) 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.


Choice 1
28800W
Choice 2
9600W
Choice 3
3200W
Choice 4 480W


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4) The figure above shows that an ideal battery is connected in parallel to two resistors with resistances 2 Ω and 4 Ω. Find the power dissipated in the 2 Ω resistor.


Choice 1
72W
Choice 2
36W
Choice 3
24W
Choice 4 12W


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5) Find the total power dissipated in the circuit above.


Choice 1
9W
Choice 2
6W
Choice 3
5W
Choice 4 12/13W


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6) Find the total power dissipated in the circuit above.

Choice 1
9W
Choice 2
6W
Choice 3
5W
Choice 4 12/13W


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7) A 2000W heater is used to heat 500 cm3of water.Find the minimum time needed to heat the water from 25 to 100 °C. (Specific Heat Capacity of water = 4200Jkg-1oC-1)

Choice 1
157.50s
Choice 2
78.75s
Choice 3
50.25s
Choice 4 40.25s


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8) An electric heater of power 3600W is used to heat water for 15 minutes. If the cost of 1 unit (kilowatthour) energy consumption is 24 cent, what is the cost of this heating process?

Choice 1
16.0 cent
Choice 2
17.2 cent
Choice 3
19.6 cent
Choice 4 21.6 cent


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9) 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.

Choice 1
50.0%
Choice 2
62.5%
Choice 3
72.5%
Choice 4 80.0%


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electromagnetism notes