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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 44 · 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 home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  2. 2.⚡ Power tells us … (a) energy used each second (b) the size of a cell (c) the length of a wire (d) the colour of light
  3. 3.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  4. 4.⚡ A 2.4 W device works on 24 V. What current does it take (in amperes)? =
  5. 5.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  6. 6.⚡ A 2.4 W device works on 12 V. What current does it take (in amperes)? =
  7. 7.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  8. 8.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  9. 9.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = I ÷ V (c) P = V + I (d) P = V × I
  10. 10.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  11. 11.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  12. 12.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  13. 13.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  14. 14.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
  15. 15.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
  16. 16.⚡ A device works on 1.5 V and takes 1 A. What is its power (in watts)? =
  17. 17.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  18. 18.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =
  19. 19.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  20. 20.⚡ A device works on 3 V and takes 1 A. What is its power (in watts)? =
  21. 21.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =
  22. 22.⚡ A device works on 9 V and takes 0.2 A. What is its power (in watts)? =
  23. 23.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
  24. 24.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
  25. 25.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  26. 26.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
  27. 27.⚡ A 1.5 W device works on 3 V. What current does it take (in amperes)? =
  28. 28.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  29. 29.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  30. 30.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  31. 31.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  32. 32.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
  33. 33.⚡ A device works on 9 V and takes 0.25 A. What is its power (in watts)? =
  34. 34.⚡ A device works on 24 V and takes 0.5 A. What is its power (in watts)? =
  35. 35.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  37. 37.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  38. 38.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  39. 39.⚡ A device works on 6 V and takes 0.25 A. What is its power (in watts)? =
  40. 40.⚡ A 1.8 W device works on 9 V. What current does it take (in amperes)? =

Answer key

  1. 230
  2. energy used each second
  3. 0.6
  4. 0.1
  5. 115
  6. 0.2
  7. 1150
  8. 0.3
  9. P = V × I
  10. 345
  11. 1
  12. 0.375
  13. 4.5
  14. 4.5
  15. 12
  16. 1.5
  17. 2.4
  18. 0.1
  19. 0.2
  20. 3
  21. 2
  22. 1.8
  23. 15
  24. 0.25
  25. 13.5
  26. 1
  27. 0.5
  28. 920
  29. 1
  30. 1840
  31. 0.2
  32. 6
  33. 2.25
  34. 12
  35. 3
  36. 9
  37. 0.1
  38. 4.8
  39. 1.5
  40. 0.2

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