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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 28 · 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.

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  1. 1.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  2. 2.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  3. 3.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  4. 4.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  5. 5.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  6. 6.⚡ A home appliance on the 230 V mains takes 10 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 home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  9. 9.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  10. 10.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  11. 11.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  12. 12.⚡ Power tells us … (a) the length of a wire (b) the size of a cell (c) energy used each second (d) the colour of light
  13. 13.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  14. 14.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V + I (c) P = I ÷ V (d) P = V × I
  15. 15.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  16. 16.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  17. 17.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
  18. 18.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  19. 19.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  20. 20.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =
  21. 21.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  22. 22.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  25. 25.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  26. 26.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  27. 27.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  28. 28.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  29. 29.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  32. 32.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  33. 33.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  34. 34.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
  35. 35.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  36. 36.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  37. 37.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  38. 38.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  39. 39.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
  40. 40.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =

Answer key

  1. 0.1
  2. 36
  3. 1840
  4. 18
  5. 2.4
  6. 2300
  7. 345
  8. 230
  9. 115
  10. 1150
  11. 3
  12. energy used each second
  13. 0.3
  14. P = V × I
  15. 0.5
  16. 2
  17. 2
  18. 460
  19. 1.5
  20. 2
  21. 2
  22. 2.4
  23. 1.5
  24. 9
  25. 1.5
  26. 0.25
  27. 1.2
  28. 0.1
  29. 3
  30. 72
  31. 1.25
  32. 10
  33. 0.25
  34. 2
  35. 0.2
  36. 0.25
  37. 920
  38. 2.25
  39. 12
  40. 4.8

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