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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 669 · 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 device works on 5 V and takes 3 A. What is its power (in watts)? =
  2. 2.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  3. 3.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  4. 4.⚡ A 24 W device works on 24 V. What current does it take (in amperes)? =
  5. 5.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V × I (d) P = V + I
  6. 6.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  7. 7.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  8. 8.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  9. 9.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  10. 10.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  11. 11.⚡ 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
  12. 12.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  13. 13.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  15. 15.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  16. 16.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  17. 17.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  18. 18.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  19. 19.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
  20. 20.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  21. 21.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  22. 22.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
  23. 23.⚡ A 12 W device works on 24 V. What current does it take (in amperes)? =
  24. 24.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  25. 25.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  26. 26.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  27. 27.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  28. 28.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
  29. 29.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  31. 31.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  32. 32.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
  34. 34.⚡ A device works on 6 V and takes 0.25 A. What is its power (in watts)? =
  35. 35.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  36. 36.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  37. 37.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =
  38. 38.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  39. 39.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  40. 40.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?

Answer key

  1. 15
  2. 0.2
  3. 48
  4. 1
  5. P = V × I
  6. 9
  7. 0.75
  8. 3
  9. 2300
  10. 460
  11. energy used each second
  12. 230
  13. 0.5
  14. 345
  15. 1.2
  16. 920
  17. 1.2
  18. 0.1
  19. 0.25
  20. 13.5
  21. 2.4
  22. 0.2
  23. 0.5
  24. 7.5
  25. 1
  26. 115
  27. 0.2
  28. 6
  29. 1.5
  30. 1.5
  31. 2
  32. 10
  33. 3
  34. 1.5
  35. 0.5
  36. 0.1
  37. 3
  38. 1.8
  39. 1.5
  40. 1150

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