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P5 Electric Circuits

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Question 1 How do you generate a current in a coil of wire?

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Question 2 Energy transferred = What is the equation used to calculate the energy transferred when a device is turned on?

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Question 3 Which of the following appliances would be the most expensive if they were each left on for 3 hours? A. Television of power rating 300W B. Light bulb of power rating 100W C. A computer with power rating 250W D. Two radios of power rating 10W

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Question 4 A Step up transformer has 10 primary coils and 15 secondary coils. The output voltage is 300V. What is the input voltage? A. 30V B. 450V C. 250V D. 200V

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Question 5 What do the abbreviations a.c. and d.c. mean? A. Alternative and direct current B. Alternating and deviating current C. Alternating and direct current D. Alternative and derivative current

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Question 6 What has the lowest cost? A. A television of 300 watts on for 1 hour B. A heater of 1500watts on for 20 minutes C. A washing machine of 3000watts accidentally on for 6 minutes D. A light bulb of 60watts on for 5 hours

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Question 7 Which of these appliances allows current to flow more when the temperature increases? A. A diode B. A thermistor C. A light dependant resistor D. A filament lamp

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Question 8 What is the correct description of a transformer? A. Two coils of wire around a metal B. Two coils around an iron core with an alternating current C. One coil around an iron core with a direct current D. One coil around two iron cores with alternating current

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Question 9 What are the units for the equation below? Power = Current x Voltage A. Watts = Volts x Ohms B. Ohms = Amps x Volts C. Watts = Amps x Volts D. Joules = Amps x Volts

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Question 10 What types of material does static electricity build up in? A. Metals B. Plastics C. Any insulator D. Magnetic materials

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