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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 584 · 40 questions
TalentJR

Remember (Push times flow): P = V × I (watts = volts × amperes). I = P ÷ V; V = P ÷ I. Example: 230 V × 2 A = 460 W; 6 W ÷ 12 V = 0.5 A.

NameDateTime takenScore ___ / 40
  1. 1.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  2. 2.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  3. 3.⚡ Power tells us … (a) the size of a cell (b) the length of a wire (c) energy used each second (d) the colour of light
  4. 4.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  5. 5.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  6. 6.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  7. 7.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  8. 8.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  9. 9.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  10. 10.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  12. 12.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = V × I (d) P = I ÷ V
  13. 13.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  15. 15.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  16. 16.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  17. 17.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
  18. 18.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  19. 19.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  20. 20.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  21. 21.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  22. 22.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  23. 23.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  24. 24.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
  25. 25.⚡ A device works on 6 V and takes 0.25 A. What is its power (in watts)? =
  26. 26.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  27. 27.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
  28. 28.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
  29. 29.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  30. 30.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  31. 31.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  32. 32.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  34. 34.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  35. 35.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  36. 36.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  37. 37.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  38. 38.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  39. 39.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  40. 40.⚡ Which formula gives electric power? (a) P = V + I (b) P = V × I (c) P = I ÷ V (d) P = V ÷ I

Answer key

  1. 9
  2. 0.2
  3. energy used each second
  4. 4.5
  5. 0.5
  6. 115
  7. 345
  8. 0.1
  9. 0.3
  10. 1.2
  11. 920
  12. P = V × I
  13. 1.8
  14. 230
  15. 1150
  16. 1
  17. 5
  18. 2.25
  19. 0.6
  20. 3
  21. 0.2
  22. 15
  23. 2
  24. 3
  25. 1.5
  26. 72
  27. 2
  28. 0.2
  29. 1840
  30. 2.4
  31. 460
  32. 6
  33. 9
  34. 0.25
  35. 0.2
  36. 0.2
  37. 1.5
  38. 0.5
  39. 1.5
  40. P = V × I

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