Mains electricity
Lesson 6 / 9
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Waxaan isbarbardhigi karaa awoodda (power) qalabka kala duwan iyo xisaabinta kharashka isticmaalkooda.
Introduction
In this lesson: I can compare the power of different appliances and work out how much they cost to use. Electrical appliances and devices use different amounts of energy each second, as indicated by their power rating. Power is a measure of the amount of energy used by or supplied to a device in one second.
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Quizzes
1. Which of the following types of circuit is used for car headlamps so that if one light stops working, the other stays lit?
- a series circuit
- Correct answer:a parallel circuit
- either a series or a parallel circuit
2. Which of the following statements is correct?
- Correct answer:Voltage is measured in parallel, current is measured in series.
- Both voltage and current are measured in parallel.
- Voltage is measured in series, current is measured in parallel.
- Both voltage and current are measured in series.
3. Which of the following statements about a circuit where a high current flows through a bulb and the voltage and current are correctly measured is correct?
- The voltmeter and the ammeter both have a high current passing through them.
- The voltmeter and the ammeter both have a low current passing through them.
- The voltmeter has a high current and the ammeter has a very low current passing.
- Correct answer:The ammeter has a high current and the voltmeter has a very low current passing.
4. In the circuit shown, what is the voltage across the electric cell if the voltage across the 8 $$\Omega$$ resistor is 2.0 V and the voltage across the 4 $$\Omega$$ resistor is 2.0 V?
- 1.0 V
- 1.33 V
- Correct answer:2.0 V
- 4.0 V
5. In the circuit shown, what will the ammeter read if the current in the resistor is 0.35 A and the current in the lamp is 0.25 A?
- 0.25 A
- 0.30 A
- 0.35 A
- Correct answer:0.60 A
6. Where does our household electricity come from?
- only fossil fuel power stations
- only nuclear power stations
- wind turbines and solar panels
- hydroelectricity plants
- Correct answer:A mix of different sources, depending on weather conditions and demand.
1. Which of the following is the unit of power?
- ohms
- volts
- amps
- Correct answer:watts
- joules
2. Which of the following devices or appliances has the greatest power rating?
lamp: 220-240 V, 50 Hz, 25W
loudspeaker: 50W- Correct answer:
toaster: 220-240 V, 50/60 Hz, 860-1050W
3. How many watts are there in a kilowatt?
- a thousandth watts
- Correct answer:a thousand watts
- a million watts
- a billion watts
4. Which of the following values is equal to 0.1 kilowatts?
- 1 watt
- 10 watts
- Correct answer:100 watts
- 1000 watts
5. How many watts are there in a gigawatt?
- 100
- 1000
- 1 000 000
- Correct answer:1 000 000 000
6. What is the cost of using a 1000 W heater for 30 min, if 1 kWh costs £0.30?
- 3 pence
- Correct answer:15 pence
- 30 pence
- 60 pence
What pupils see
The same lesson as a pupil sees it. You can set any section as work on its own.
- IntroductionPrepare
- Starter quizActivate · 6 questions
- Lesson videoLearn
- Exit quizCheck · 6 questions