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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 684 · 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 home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  2. 2.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V × I (c) P = V ÷ I (d) P = V + I
  3. 3.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  4. 4.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  5. 5.⚡ Power tells us … (a) energy used each second (b) the colour of light (c) the size of a cell (d) the length of a wire
  6. 6.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  7. 7.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  8. 8.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =
  9. 9.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  10. 10.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  11. 11.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  12. 12.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  13. 13.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
  14. 14.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  15. 15.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  16. 16.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  17. 17.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  18. 18.⚡ A device works on 9 V and takes 0.5 A. What is its power (in watts)? =
  19. 19.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  20. 20.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  21. 21.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  22. 22.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  23. 23.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  24. 24.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  25. 25.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  26. 26.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  27. 27.⚡ A device works on 5 V and takes 2 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  29. 29.⚡ A 6 W device works on 24 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  31. 31.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  32. 32.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  33. 33.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 12 V and takes 0.5 A. What is its power (in watts)? =
  35. 35.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  36. 36.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  39. 39.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
  40. 40.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?

Answer key

  1. 230
  2. P = V × I
  3. 115
  4. 0.5
  5. energy used each second
  6. 18
  7. 2.4
  8. 3
  9. 1
  10. 0.25
  11. 2
  12. 0.25
  13. 0.25
  14. 920
  15. 0.5
  16. 1.5
  17. 2300
  18. 4.5
  19. 4.5
  20. 1840
  21. 2.25
  22. 0.1
  23. 0.6
  24. 1.5
  25. 0.3
  26. 1150
  27. 10
  28. 24
  29. 0.25
  30. 12
  31. 0.2
  32. 27
  33. 1.5
  34. 6
  35. 1.5
  36. 4.5
  37. 12
  38. 1
  39. 0.2
  40. 460

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