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Electronics Worksheet: Simple Circuit – Open and Closed

Electronics lesson 4: Open and closed circuits · Set 126 · 40 questions
TalentJR

Remember (Follow the loop): Closed circuit = complete loop = current flows; open circuit = a break = no current. Check every part: live cell, good bulb, switch ON, all wires joined, any gap bridged by a conductor. If even one check fails, the bulb does not glow.

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  1. 1.🔁 Is the circuit closed or open if a wire is cut? (a) open (b) closed
  2. 2.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. A gap in one wire is bridged by a glass marble. Does the bulb glow? (a) Yes (b) No
  3. 3.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a ceramic cup. Does the bulb glow? (a) No (b) Yes
  4. 4.Which of these means the circuit is closed? (a) a wire is cut (b) a wire has come loose (c) a cell is taken out (d) the loop is complete
  5. 5.True or false: if a wire is cut, the circuit is open and no current flows. (a) True (b) False
  6. 6.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
  7. 7.🔁 Is the circuit closed or open if the switch is OFF? (a) open (b) closed
  8. 8.Which of these means the circuit is closed? (a) a wire has come loose (b) a cell is taken out (c) the switch is ON (d) the switch is OFF
  9. 9.True or false: if the bulb is unscrewed, the circuit is open and no current flows. (a) False (b) True
  10. 10.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
  11. 11.🔁 Is the circuit closed or open if a wire has come loose? (a) closed (b) open
  12. 12.🔁 Is the circuit closed or open if the loop is complete? (a) closed (b) open
  13. 13.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the glass (b) the base (c) the filament (d) the switch
  14. 14.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
  15. 15.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) a wire is cut (c) a wire has come loose (d) all wires are joined
  16. 16.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a cotton thread. Does the bulb glow? (a) Yes (b) No
  17. 17.Which of these means the circuit is open? (a) the switch is ON (b) the loop is complete (c) the switch is OFF (d) all wires are joined
  18. 18.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. A gap in one wire is bridged by a safety pin. Does the bulb glow? (a) Yes (b) No
  19. 19.🔁 Is the circuit closed or open if all wires are joined? (a) closed (b) open
  20. 20.Which of these means the circuit is open? (a) all wires are joined (b) the switch is ON (c) the loop is complete (d) the bulb is unscrewed
  21. 21.True or false: if the switch is ON, the circuit is open and no current flows. (a) False (b) True
  22. 22.🔁 What do we call a circuit with a break in it? (a) an open circuit (b) a closed circuit (c) a series circuit (d) a full circuit
  23. 23.Which of these means the circuit is open? (a) a wire has come loose (b) the switch is ON (c) all wires are joined (d) the loop is complete
  24. 24.Which of these means the circuit is open? (a) all wires are joined (b) the switch is ON (c) a cell is taken out (d) the loop is complete
  25. 25.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a graphite rod. Does the bulb glow? (a) Yes (b) No
  26. 26.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a rubber band. Does the bulb glow? (a) No (b) Yes
  27. 27.True or false: if a wire has come loose, the circuit is open and no current flows. (a) True (b) False
  28. 28.True or false: if the switch is OFF, the circuit is closed and current flows. (a) True (b) False
  29. 29.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) both of them (b) none (c) it does not matter (d) only one
  30. 30.True or false: if the switch is ON, the circuit is closed and current flows. (a) False (b) True
  31. 31.True or false: if the loop is complete, the circuit is open and no current flows. (a) True (b) False
  32. 32.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a plastic ruler. Does the bulb glow? (a) No (b) Yes
  33. 33.True or false: if a wire has come loose, the circuit is closed and current flows. (a) True (b) False
  34. 34.Which of these means the circuit is open? (a) the loop is complete (b) a wire is cut (c) the switch is ON (d) all wires are joined
  35. 35.🔁 Is the circuit closed or open if a cell is taken out? (a) open (b) closed
  36. 36.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a brass key. Does the bulb glow? (a) No (b) Yes
  37. 37.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. A gap in one wire is bridged by a cotton thread. Does the bulb glow? (a) No (b) Yes
  38. 38.🔦 A circuit has a used-up (dead) cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a cotton thread. Does the bulb glow? (a) Yes (b) No
  39. 39.True or false: if a wire is cut, the circuit is closed and current flows. (a) True (b) False
  40. 40.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. A gap in one wire is bridged by a graphite rod. Does the bulb glow? (a) Yes (b) No

Answer key

  1. open
  2. No
  3. No
  4. the loop is complete
  5. True
  6. No
  7. open
  8. the switch is ON
  9. True
  10. closed
  11. open
  12. closed
  13. the filament
  14. Yes
  15. all wires are joined
  16. No
  17. the switch is OFF
  18. No
  19. closed
  20. the bulb is unscrewed
  21. False
  22. an open circuit
  23. a wire has come loose
  24. a cell is taken out
  25. Yes
  26. No
  27. True
  28. False
  29. both of them
  30. True
  31. False
  32. No
  33. False
  34. a wire is cut
  35. open
  36. No
  37. No
  38. No
  39. False
  40. No

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