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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 654 · 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 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  2. 2.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  3. 3.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  4. 4.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  5. 5.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  6. 6.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  7. 7.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  8. 8.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  9. 9.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  10. 10.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V × I (c) P = V + I (d) P = V ÷ I
  11. 11.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  12. 12.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
  13. 13.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  14. 14.⚡ Power tells us … (a) the length of a wire (b) the colour of light (c) energy used each second (d) the size of a cell
  15. 15.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  16. 16.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  17. 17.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  18. 18.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  19. 19.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  20. 20.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
  21. 21.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  22. 22.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  23. 23.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  24. 24.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  25. 25.⚡ A device works on 12 V and takes 1 A. What is its power (in watts)? =
  26. 26.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  27. 27.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  29. 29.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  30. 30.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  31. 31.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
  32. 32.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  33. 33.⚡ A device works on 9 V and takes 1 A. What is its power (in watts)? =
  34. 34.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  35. 35.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
  37. 37.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
  38. 38.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  39. 39.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =

Answer key

  1. 0.25
  2. 1150
  3. 345
  4. 1.5
  5. 2300
  6. 0.1
  7. 4.5
  8. 0.5
  9. 0.25
  10. P = V × I
  11. 2
  12. 3
  13. 0.3
  14. energy used each second
  15. 0.2
  16. 0.1
  17. 0.5
  18. 0.2
  19. 0.75
  20. 0.2
  21. 1.5
  22. 460
  23. 115
  24. 1840
  25. 12
  26. 0.1
  27. 2.25
  28. 0.6
  29. 4.5
  30. 3
  31. 36
  32. 0.1
  33. 9
  34. 0.6
  35. 0.2
  36. 6
  37. 1
  38. 9
  39. 3
  40. 4.8

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