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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 767 · 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 8 A. What is its power (in watts)?
  2. 2.⚡ A device works on 1.5 V and takes 2 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 3 V and takes 1.5 A. What is its power (in watts)? =
  5. 5.⚡ A 1.2 W device works on 6 V. What current does it take (in amperes)? =
  6. 6.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  7. 7.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  8. 8.⚡ A 24 W device works on 24 V. What current does it take (in amperes)? =
  9. 9.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V + I (c) P = I ÷ V (d) P = V × I
  10. 10.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  11. 11.⚡ A 0.5 W device works on 5 V. What current does it take (in amperes)? =
  12. 12.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  13. 13.⚡ A device works on 5 V and takes 1.5 A. What is its power (in watts)? =
  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 12 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 6 W device works on 12 V. What current does it take (in amperes)? =
  18. 18.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
  19. 19.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  20. 20.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  21. 21.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  22. 22.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  24. 24.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  25. 25.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  26. 26.⚡ A device works on 5 V and takes 0.5 A. What is its power (in watts)? =
  27. 27.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
  28. 28.⚡ A 12 W device works on 12 V. What current does it take (in amperes)? =
  29. 29.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
  30. 30.⚡ A 13.5 W device works on 9 V. What current does it take (in amperes)? =
  31. 31.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  32. 32.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  33. 33.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  34. 34.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  35. 35.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  36. 36.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  39. 39.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =
  40. 40.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =

Answer key

  1. 1840
  2. 3
  3. energy used each second
  4. 4.5
  5. 0.2
  6. 0.1
  7. 0.25
  8. 1
  9. P = V × I
  10. 2300
  11. 0.1
  12. 36
  13. 7.5
  14. 345
  15. 2.4
  16. 920
  17. 0.5
  18. 0.15
  19. 230
  20. 115
  21. 1150
  22. 2.4
  23. 13.5
  24. 460
  25. 0.9
  26. 2.5
  27. 2
  28. 1
  29. 2
  30. 1.5
  31. 0.25
  32. 1.8
  33. 0.1
  34. 4.5
  35. 24
  36. 4.8
  37. 1.5
  38. 3
  39. 2
  40. 0.5

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