1. P5 Electric Circuits

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

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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

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