P5 Electric Circuits

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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
What is the equation used to calculate the energy
transferred when a device is turned on?

• Energy transferred

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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?
• Television of power rating 300W
• Light bulb of power rating 100W
• A computer with power rating 250W
• 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?
• 30V
• 450V
• 250V
• 200V

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Question 5

• What do the abbreviations a.c. and d.c.
• mean?
• Alternative and direct current
• Alternating and deviating current
• Alternating and direct current
• Alternative and derivative current

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Question 6

• What has the lowest cost?
• A television of 300 watts on for 1 hour
• A heater of 1500watts on for 20 minutes
• A washing machine of 3000watts accidentally on
  for 6 minutes
• 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 diode
• A thermistor
• A light dependant resistor
• A filament lamp

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Question 8

• What is the correct description of a
• transformer?
• Two coils of wire around a metal
• Two coils around an iron core with an alternating
  current
• One coil around an iron core with a direct
  current
• 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
• Watts Volts x Ohms
• Ohms Amps x Volts
• Watts Amps x Volts
• Joules Amps x Volts

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Question 10

• What types of material does static electricity
• build up in?
• Metals
• Plastics
• Any insulator
• Magnetic materials