9. What is the source of electricity in a simple electric circuit? A. wet cell B. body cell C. dry cell D. electric cell 10. Which of the following is NOT a component of an electric circuit? A. power supply B. resistance C. switch D. insulator 11. What component does this circuit symbol represent? A. dry cell B. buzzer C. capacitor D. switch 12. Which device protects the circuit from damage if a short circuit occurs? A. battery B. fuse C. bulb D. electromagnet 13. The following shows how electricity is used except one. Which one is it? A. Light bulbs use electricity to produce heat. B. Radio uses electricity to produce sound. C. Oven toaster uses electricity to produce heat. D. Electricity can be produced by transforming mechanical energy into electrical energy 14. Electric energy is commonly used because A. it is clean. C. it is cheap B. it can be changed into other D. it is the only available energy. forms of energy 15. What happens when the switch is on? A. Electricity flows in a complete circuit. B. Electricity flown in an open circuit. C. Electricity does not flow in a complete D. Electricity stops flowing.
