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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 309 · 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 4.5 W device works on 3 V. What current does it take (in amperes)? =
  2. 2.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  3. 3.⚡ Power tells us … (a) the size of a cell (b) energy used each second (c) the length of a wire (d) the colour of light
  4. 4.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  5. 5.⚡ Which formula gives electric power? (a) P = V × I (b) P = I ÷ V (c) P = V ÷ I (d) P = V + I
  6. 6.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  7. 7.⚡ A 12 W device works on 24 V. What current does it take (in amperes)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  9. 9.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  10. 10.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  11. 11.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  12. 12.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  13. 13.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  14. 14.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  15. 15.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  16. 16.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  17. 17.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  18. 18.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  19. 19.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  20. 20.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  21. 21.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  22. 22.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  23. 23.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  24. 24.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  25. 25.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
  26. 26.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  27. 27.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  28. 28.⚡ A 6 W device works on 24 V. What current does it take (in amperes)? =
  29. 29.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 6 V and takes 0.2 A. What is its power (in watts)? =
  31. 31.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  32. 32.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  33. 33.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  35. 35.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  36. 36.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =
  37. 37.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  38. 38.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  39. 39.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  40. 40.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?

Answer key

  1. 1.5
  2. 4.5
  3. energy used each second
  4. 2.4
  5. P = V × I
  6. 0.3
  7. 0.5
  8. 115
  9. 24
  10. 0.1
  11. 0.75
  12. 0.6
  13. 230
  14. 1.5
  15. 0.9
  16. 24
  17. 0.1
  18. 0.2
  19. 0.5
  20. 36
  21. 0.3
  22. 4.8
  23. 345
  24. 1.25
  25. 0.25
  26. 460
  27. 0.75
  28. 0.25
  29. 1.5
  30. 1.2
  31. 0.1
  32. 1150
  33. 0.5
  34. 1.2
  35. 18
  36. 1
  37. 0.15
  38. 0.2
  39. 4.5
  40. 2300

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