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Electronics Worksheet: Cells and Batteries

Electronics lesson 6: Cells and batteries · Set 39 · 40 questions
TalentJR

Remember (Line them up, add them up): Series (+ to −): total voltage = add the cells; n identical cells = n × one cell. Parallel (identical cells, + with +): the voltage stays the same as one cell. The bump end is +, the flat end is −; the long line in the symbol is +.

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  1. 1.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
  2. 2.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) + (positive) (b) − (negative)
  3. 3.🔋 What should you do with used-up cells? (a) cut them open (b) bury them in soil (c) give them for recycling (d) throw them in a fire
  4. 4.🔋 6 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
  5. 5.🔋 A 3 V battery and one 1.5 V cell are joined in series, all facing the same way. What is the total voltage (in volts)? =
  6. 6.🔋 5 identical 1.5 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
  7. 7.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
  8. 8.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) + (positive) (b) − (negative)
  9. 9.🔋 2 identical 1.2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
  10. 10.🔋 How many volts does one ordinary torch cell give? (a) 15 V (b) 0.5 V (c) 230 V (d) 1.5 V
  11. 11.True or false: on a cell, “the flat end” means the + (positive) end. (a) True (b) False
  12. 12.🔋 8 identical 1.5 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
  13. 13.🔋 6 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
  14. 14.🔋 How many 1.2 V cells must be joined in series to give 7.2 V?
  15. 15.🔋 Identical cells side by side (in parallel) give … (a) half the voltage (b) the same voltage (c) double the voltage (d) no voltage
  16. 16.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
  17. 17.🔋 How many 3 V cells must be joined in series to give 21 V?
  18. 18.True or false: on a cell, “the longer symbol line” means the − (negative) end. (a) False (b) True
  19. 19.🔋 7 identical 2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
  20. 20.🔋 8 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
  21. 21.🔋 How many 1.5 V cells must be joined in series to give 12 V?
  22. 22.True or false: on a cell, “usually the black wire” means the + (positive) end. (a) True (b) False
  23. 23.🔋 7 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
  24. 24.True or false: on a cell, “usually the black wire” means the − (negative) end. (a) True (b) False
  25. 25.True or false: on a cell, “usually the red wire” means the + (positive) end. (a) False (b) True
  26. 26.🔋 What is a battery? (a) a kind of bulb (b) two or more cells joined (c) a switch with a lid (d) one single wire
  27. 27.🔋 3 identical 2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
  28. 28.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
  29. 29.🔋 7 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
  30. 30.🔋 A 6 V battery and two 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
  31. 31.🔋 Cells joined + to − in a row (series) give … (a) a smaller voltage (b) the same voltage (c) no voltage (d) a bigger voltage
  32. 32.🔋 A 9 V battery and three 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
  33. 33.🔋 5 identical 3 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
  34. 34.True or false: on a cell, “the shorter symbol line” means the + (positive) end. (a) False (b) True
  35. 35.🔋 How many 2 V cells must be joined in series to give 8 V?
  36. 36.🔋 3 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
  37. 37.True or false: on a cell, “the end with a bump” means the − (negative) end. (a) False (b) True
  38. 38.🔋 8 identical 2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
  39. 39.🔋 How many 2 V cells must be joined in series to give 16 V?
  40. 40.🔋 6 identical 1.5 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =

Answer key

  1. + (positive)
  2. − (negative)
  3. give them for recycling
  4. 7.2
  5. 4.5
  6. 7.5
  7. + (positive)
  8. + (positive)
  9. 1.2
  10. 1.5 V
  11. False
  12. 12
  13. 6
  14. 6
  15. the same voltage
  16. − (negative)
  17. 7
  18. False
  19. 14
  20. 9
  21. 8
  22. False
  23. 8.4
  24. True
  25. True
  26. two or more cells joined
  27. 2
  28. − (negative)
  29. 7.5
  30. 9
  31. a bigger voltage
  32. 13.5
  33. 3
  34. False
  35. 4
  36. 1.5
  37. False
  38. 16
  39. 8
  40. 1.5

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