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Electronics Worksheet: Simple Circuit – Open and Closed

Electronics lesson 4: Open and closed circuits · Set 473 · 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.Which of these means the circuit is open? (a) the loop is complete (b) the bulb is unscrewed (c) all wires are joined (d) the switch is ON
  2. 2.True or false: if a wire has come loose, the circuit is closed and current flows. (a) True (b) False
  3. 3.🔁 Is the circuit closed or open if a wire is cut? (a) open (b) closed
  4. 4.🔦 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
  5. 5.True or false: if all wires are joined, the circuit is open and no current flows. (a) False (b) True
  6. 6.🔁 Is the circuit closed or open if the switch is OFF? (a) open (b) closed
  7. 7.Which of these means the circuit is open? (a) all wires are joined (b) the switch is ON (c) the switch is OFF (d) the loop is complete
  8. 8.🔁 Is the circuit closed or open if all wires are joined? (a) closed (b) open
  9. 9.True or false: if a wire is cut, the circuit is open and no current flows. (a) False (b) True
  10. 10.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) the switch is ON
  11. 11.🔦 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 copper wire. Does the bulb glow? (a) No (b) Yes
  12. 12.🔦 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) No (b) Yes
  13. 13.🔁 What must there be for a current to flow? (a) a broken path (b) a plastic gap (c) one loose end (d) a complete loop
  14. 14.🔦 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 ceramic cup. Does the bulb glow? (a) No (b) Yes
  15. 15.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) all wires are joined (c) a wire has come loose (d) a wire is cut
  16. 16.True or false: if the loop is complete, the circuit is open and no current flows. (a) False (b) True
  17. 17.🔁 Is the circuit closed or open if the loop is complete? (a) open (b) closed
  18. 18.🔦 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
  19. 19.Which of these means the circuit is open? (a) the switch is ON (b) the loop is complete (c) all wires are joined (d) a wire has come loose
  20. 20.🔦 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) No (b) Yes
  21. 21.🔁 What do we call a circuit with a break in it? (a) a full circuit (b) a series circuit (c) an open circuit (d) a closed circuit
  22. 22.True or false: if the switch is OFF, the circuit is closed and current flows. (a) True (b) False
  23. 23.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
  24. 24.Which of these means the circuit is open? (a) the loop is complete (b) a cell is taken out (c) the switch is ON (d) all wires are joined
  25. 25.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the glass (b) the filament (c) the switch (d) the base
  26. 26.True or false: if a cell is taken out, the circuit is open and no current flows. (a) False (b) True
  27. 27.Which of these means the circuit is closed? (a) a wire is cut (b) the switch is OFF (c) a cell is taken out (d) the loop is complete
  28. 28.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) open (b) closed
  29. 29.🔦 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
  30. 30.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) both of them (b) none (c) only one (d) it does not matter
  31. 31.🔦 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 metal paper clip. Does the bulb glow? (a) Yes (b) No
  32. 32.True or false: if the loop is complete, the circuit is closed and current flows. (a) True (b) False
  33. 33.🔦 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 plastic ruler. Does the bulb glow? (a) No (b) Yes
  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 safety pin. Does the bulb glow? (a) No (b) Yes
  35. 35.True or false: if a cell is taken out, the circuit is closed and current flows. (a) False (b) True
  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 steel coin. 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. 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
  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 plastic straw. Does the bulb glow? (a) Yes (b) No
  39. 39.🔦 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) No (b) Yes
  40. 40.🔦 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

Answer key

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

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