I. Choose the letter of the correct answer. Write the letter beside the number. a 21. What is the source of electricity in an electric circuit? Wet cel b. Body cel c. dry cell d. electric cel 22. Which of the following is a kind of circuit where electricity cannot flowe a. Closed circuit b. Semi circuit C. open circuit di incomplete circuit 23. In which circuit will electricity flow and make a light bulb emit light when the switch is one a. open b. fixed C. closed d new 24. Which of the following is not a component of an electric circuits a. Power supply b. Switch c. resistance d. insulator 25. Why should you noi tum on switch if your hands are wet a. The switch will cut off electricity. b. The switch will not move. C. The wet hand may conduct electricity. d. The water will destroy the switch​