← Open and closed circuits lesson New set →

Electronics Worksheet: Simple Circuit – Open and Closed

Electronics lesson 4: Open and closed circuits · Set 43 · 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.

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

Answer key

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

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids