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4.2.5. Electrical energy and electrical power
A subsection of Physics, 0625, through 4. Electricity and magnetism
Listing 10 of 62 questions
shows the electrical symbols for some circuit components. Draw a line from each electrical symbol to the name of the circuit component it represents. electrical symbol circuit component fuse lamp heater thermistor shows a circuit including a battery, a fixed resistor R and an ammeter. A R The reading on the ammeter is 0.38 A. The potential difference across the fixed resistor R is 12 V. Calculate the resistance of the fixed resistor R. resistance = Ω Calculate the electrical power transferred in the fixed resistor R. Include the unit. power transferred = unit
0625_s23_qp_33
THEORY
2023
Paper 3, Variant 3
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A farmer uses an electric pump to raise water from a river in order to fill the irrigation channels that keep the soil in his fields moist. water pours into channel field electric pump water rises up tube 3 m river irrigation channel Every minute, the pump raises 12 kg of water through a vertical height of 3 m. Calculate the increase in the gravitational potential energy of 12 kg of water when it is raised 3 m. increase in gravitational potential energy = Calculate the useful power output of the pump as it raises the water. power =
0625_w09_qp_31
THEORY
2009
Paper 3, Variant 1
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A farmer uses an electric pump to raise water from a river in order to fill the irrigation channels that keep the soil in his fields moist. water pours into channel field electric pump water rises up tube 3 m river irrigation channel Every minute, the pump raises 12 kg of water through a vertical height of 3 m. Calculate the increase in the gravitational potential energy of 12 kg of water when it is raised 3 m. increase in gravitational potential energy = Calculate the useful power output of the pump as it raises the water. power =
0625_w09_qp_32
THEORY
2009
Paper 3, Variant 2
View
shows a model cable-car system. It is driven by an electric motor coupled to a gear system. 2.0 m 6.0 m gears electric motor model cable-car smooth pulley The model cable-car has a mass of 5.0 kg and is lifted from the bottom pulley to the top pulley in 40 s. It stops automatically at the top. Calculate the average speed of the cable-car, average speed = the gravitational potential energy gained by the cable-car, gravitational potential energy gained = the useful output power of the driving mechanism. power = How would the electrical power input to the motor compare with your answer to ?
0625_w10_qp_31
THEORY
2010
Paper 3, Variant 1
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An electric motor is used to lift a load. The energy involved is shown in . energy input to motor 100 J work done in lifting load 80 J waste energy 20 J State the term used to describe the energy gained by the load due to its increase in height. What effect does the waste energy from the motor have on its surroundings? State the principle of conservation of energy and explain how it applies to the working of the motor. Use information from in your answer. The electrical power for the motor is generated in a coal-fired power station. State two benefits of using coal-fired power stations and state two problems that arise from their use. benefits 1. 2. problems 1. 2.
0625_w16_qp_31
THEORY
2016
Paper 3, Variant 1
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Questions Discovered
62