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Electronics Worksheet: Simple Circuit – Open and Closed

Electronics lesson 4: Open and closed circuits · Set 264 · 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.🔦 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) Yes (b) No
  2. 2.🔦 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 aluminium foil. Does the bulb glow? (a) Yes (b) No
  3. 3.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
  4. 4.🔁 Is the circuit closed or open if a wire is cut? (a) open (b) closed
  5. 5.True or false: if the loop is complete, the circuit is closed and current flows. (a) True (b) False
  6. 6.True or false: if the switch is OFF, the circuit is closed and current flows. (a) True (b) False
  7. 7.🔦 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 an iron nail. Does the bulb glow? (a) Yes (b) No
  8. 8.🔦 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 safety pin. Does the bulb glow? (a) Yes (b) No
  9. 9.True or false: if the switch is ON, the circuit is closed and current flows. (a) False (b) True
  10. 10.Which of these means the circuit is closed? (a) a wire is cut (b) a cell is taken out (c) a wire has come loose (d) all wires are joined
  11. 11.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) both of them (b) only one (c) it does not matter (d) none
  12. 12.Which of these means the circuit is open? (a) the switch is ON (b) a wire is cut (c) the loop is complete (d) all wires are joined
  13. 13.🔦 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 wooden stick. Does the bulb glow? (a) Yes (b) No
  14. 14.🔁 Is the circuit closed or open if a wire has come loose? (a) open (b) closed
  15. 15.🔦 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 eraser. Does the bulb glow? (a) No (b) Yes
  16. 16.🔁 What do we call a circuit with a break in it? (a) a full circuit (b) a closed circuit (c) an open circuit (d) a series circuit
  17. 17.Which of these means the circuit is open? (a) the switch is ON (b) the bulb is unscrewed (c) all wires are joined (d) the loop is complete
  18. 18.True or false: if the bulb is unscrewed, the circuit is closed and current flows. (a) False (b) True
  19. 19.True or false: if a wire has come loose, the circuit is closed and current flows. (a) False (b) True
  20. 20.🔁 Is the circuit closed or open if the switch is OFF? (a) open (b) closed
  21. 21.True or false: if all wires are joined, the circuit is open and no current flows. (a) False (b) True
  22. 22.Which of these means the circuit is closed? (a) a wire has come loose (b) the switch is OFF (c) the switch is ON (d) a cell is taken out
  23. 23.🔦 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
  24. 24.True or false: if a wire is cut, the circuit is open and no current flows. (a) True (b) False
  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 steel spoon. Does the bulb glow? (a) No (b) Yes
  26. 26.True or false: if the loop is complete, the circuit is open and no current flows. (a) True (b) False
  27. 27.True or false: if a wire is cut, the circuit is closed and current flows. (a) True (b) False
  28. 28.Which of these means the circuit is open? (a) the loop is complete (b) the switch is ON (c) all wires are joined (d) a wire has come loose
  29. 29.True or false: if all wires are joined, the circuit is closed and current flows. (a) False (b) True
  30. 30.Which of these means the circuit is open? (a) a cell is taken out (b) the loop is complete (c) all wires are joined (d) the switch is ON
  31. 31.True or false: if a cell is taken out, the circuit is open and no current flows. (a) False (b) True
  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 dry cork. Does the bulb glow? (a) No (b) Yes
  33. 33.🔁 What must there be for a current to flow? (a) a complete loop (b) a broken path (c) a plastic gap (d) one loose end
  34. 34.🔦 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 brass key. Does the bulb glow? (a) Yes (b) No
  35. 35.🔦 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 brass key. Does the bulb glow? (a) No (b) Yes
  36. 36.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) open (b) closed
  37. 37.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) a wire has come loose (c) the loop is complete (d) the switch is OFF
  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 copper wire. Does the bulb glow? (a) No (b) Yes
  39. 39.🔦 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 dry cork. Does the bulb glow? (a) Yes (b) No
  40. 40.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No

Answer key

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

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