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Electronics Worksheet: Electric Power

Electronics lesson 18: Electric power · Set 201 · 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 36 W device works on 24 V. What current does it take (in amperes)? =
  2. 2.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
  3. 3.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  4. 4.⚡ Which formula gives electric power? (a) P = V × I (b) P = I ÷ V (c) P = V ÷ I (d) P = V + I
  5. 5.⚡ A 9 W device works on 3 V. What current does it take (in amperes)? =
  6. 6.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
  7. 7.⚡ A 10 W device works on 5 V. What current does it take (in amperes)? =
  8. 8.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
  9. 9.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
  10. 10.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
  11. 11.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  12. 12.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  13. 13.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
  14. 14.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
  15. 15.⚡ 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
  16. 16.⚡ A 6 W device works on 6 V. What current does it take (in amperes)? =
  17. 17.⚡ A 4.5 W device works on 3 V. What current does it take (in amperes)? =
  18. 18.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
  19. 19.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
  20. 20.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
  21. 21.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  22. 22.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
  23. 23.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
  24. 24.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
  25. 25.⚡ A device works on 5 V and takes 0.5 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 12 V and takes 1.5 A. What is its power (in watts)? =
  28. 28.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  29. 29.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
  30. 30.⚡ A device works on 24 V and takes 1 A. What is its power (in watts)? =
  31. 31.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
  32. 32.⚡ A 48 W device works on 24 V. What current does it take (in amperes)? =
  33. 33.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  34. 34.⚡ A device works on 1.5 V and takes 1.5 A. What is its power (in watts)? =
  35. 35.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
  36. 36.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  37. 37.⚡ A 6 W device works on 12 V. What current does it take (in amperes)? =
  38. 38.⚡ A 1 W device works on 5 V. What current does it take (in amperes)? =
  39. 39.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  40. 40.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =

Answer key

  1. 1.5
  2. 0.1
  3. 4.8
  4. P = V × I
  5. 3
  6. 1150
  7. 2
  8. 0.375
  9. 3
  10. 5
  11. 230
  12. 1.5
  13. 1.2
  14. 2
  15. energy used each second
  16. 1
  17. 1.5
  18. 0.9
  19. 1
  20. 460
  21. 2300
  22. 2
  23. 1840
  24. 0.2
  25. 2.5
  26. 0.1
  27. 18
  28. 1.5
  29. 0.6
  30. 24
  31. 0.1
  32. 2
  33. 115
  34. 2.25
  35. 0.25
  36. 0.3
  37. 0.5
  38. 0.2
  39. 920
  40. 18

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