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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 273 · 40 questions
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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 1.5 V and takes 0.2 A. What is its power (in watts)? =
  2. 2.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  3. 3.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  4. 4.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  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 home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  7. 7.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  8. 8.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
  9. 9.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
  10. 10.⚡ Power tells us … (a) the colour of light (b) the length of a wire (c) energy used each second (d) the size of a cell
  11. 11.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  12. 12.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
  13. 13.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
  14. 14.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  15. 15.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  16. 16.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =
  17. 17.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  18. 18.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  19. 19.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  20. 20.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
  21. 21.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  22. 22.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  23. 23.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  24. 24.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  25. 25.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  27. 27.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  28. 28.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  30. 30.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  31. 31.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
  32. 32.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  33. 33.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  34. 34.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  35. 35.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  36. 36.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
  37. 37.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  38. 38.⚡ A 24 W device works on 24 V. What current does it take (in amperes)? =
  39. 39.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  40. 40.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?

Answer key

  1. 0.3
  2. 0.1
  3. 345
  4. 0.25
  5. P = V × I
  6. 1150
  7. 460
  8. 2
  9. 0.5
  10. energy used each second
  11. 12
  12. 2
  13. 18
  14. 0.75
  15. 0.3
  16. 0.2
  17. 1840
  18. 1.2
  19. 0.1
  20. 1
  21. 0.75
  22. 1.5
  23. 2.4
  24. 4.5
  25. 1.5
  26. 0.6
  27. 2300
  28. 1.5
  29. 1.5
  30. 0.5
  31. 0.25
  32. 18
  33. 0.2
  34. 920
  35. 36
  36. 1
  37. 0.1
  38. 1
  39. 0.25
  40. 230

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