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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 128 · 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 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  2. 2.⚡ A 24 W device works on 24 V. What current does it take (in amperes)? =
  3. 3.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  4. 4.⚡ Power tells us … (a) the size of a cell (b) the colour of light (c) energy used each second (d) the length of a wire
  5. 5.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  6. 6.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
  7. 7.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  8. 8.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  9. 9.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  10. 10.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
  11. 11.⚡ Which formula gives electric power? (a) P = V × I (b) P = V ÷ I (c) P = V + I (d) P = I ÷ V
  12. 12.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  13. 13.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  14. 14.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
  15. 15.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  16. 16.⚡ A device works on 3 V and takes 0.1 A. What is its power (in watts)? =
  17. 17.⚡ A 7.5 W device works on 5 V. What current does it take (in amperes)? =
  18. 18.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  19. 19.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  20. 20.⚡ A device works on 3 V and takes 0.2 A. What is its power (in watts)? =
  21. 21.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  22. 22.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =
  23. 23.⚡ A 1.5 W device works on 6 V. What current does it take (in amperes)? =
  24. 24.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  25. 25.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  26. 26.⚡ A device works on 3 V and takes 3 A. What is its power (in watts)? =
  27. 27.⚡ A device works on 5 V and takes 0.25 A. What is its power (in watts)? =
  28. 28.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
  29. 29.⚡ A 6 W device works on 24 V. What current does it take (in amperes)? =
  30. 30.⚡ A device works on 9 V and takes 2 A. What is its power (in watts)? =
  31. 31.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
  32. 32.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =
  33. 33.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
  34. 34.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  35. 35.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 5 V and takes 0.2 A. What is its power (in watts)? =
  37. 37.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  38. 38.⚡ A device works on 6 V and takes 2 A. What is its power (in watts)? =
  39. 39.⚡ A 3 W device works on 12 V. What current does it take (in amperes)? =
  40. 40.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =

Answer key

  1. 0.5
  2. 1
  3. 115
  4. energy used each second
  5. 1150
  6. 9
  7. 0.2
  8. 2300
  9. 230
  10. 6
  11. P = V × I
  12. 0.1
  13. 2
  14. 4.5
  15. 0.2
  16. 0.3
  17. 1.5
  18. 920
  19. 0.6
  20. 0.6
  21. 0.25
  22. 48
  23. 0.25
  24. 1840
  25. 1.5
  26. 9
  27. 1.25
  28. 0.75
  29. 0.25
  30. 18
  31. 2
  32. 2
  33. 36
  34. 345
  35. 3
  36. 1
  37. 0.5
  38. 12
  39. 0.25
  40. 0.15

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