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Electronics Worksheet: Ohm’s Law – Find the Voltage

Electronics lesson 12: Ohm’s law: find the voltage · Set 6 · 40 questions
TalentJR

Remember (V on top): V = I × R (volts = amperes × ohms). Change mA to A first: 20 mA = 0.02 A. Example: 0.02 A × 220 Ω = 4.4 V.

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  1. 1.🔺 A current of 0.1 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
  2. 2.🔺 A current of 0.5 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
  3. 3.🔺 A current of 0.5 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  4. 4.🔺 A current of 25 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
  5. 5.🔺 A current of 25 mA flows through a 250 Ω resistor. What is the voltage across it (in volts)? =
  6. 6.🔺 A current of 2.5 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
  7. 7.🔺 A current of 25 mA flows through a 300 Ω resistor. What is the voltage across it (in volts)? =
  8. 8.🔺 A current of 10 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
  9. 9.🔺 A current of 10 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
  10. 10.🔺 A current of 0.1 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
  11. 11.🔺 A current of 0.25 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
  12. 12.🔺 A current of 40 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
  13. 13.🔺 A current of 2.5 A flows through a 20 Ω resistor. What is the voltage across it (in volts)? =
  14. 14.🔺 A current of 1 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  15. 15.🔺 In the V-I-R triangle, how do we find V? (a) V = I ÷ R (b) V = R ÷ I (c) V = I × R (d) V = I + R
  16. 16.🔺 A current of 2.5 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
  17. 17.🔺 A current of 1.5 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
  18. 18.🔺 A current of 10 mA flows through a 250 Ω resistor. What is the voltage across it (in volts)? =
  19. 19.🔺 A current of 40 mA flows through a 400 Ω resistor. What is the voltage across it (in volts)? =
  20. 20.🔺 A current of 50 mA flows through a 400 Ω resistor. What is the voltage across it (in volts)? =
  21. 21.🔺 A current of 0.25 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
  22. 22.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets bigger (b) stays the same (c) becomes zero (d) gets smaller
  23. 23.🔺 A current of 50 mA flows through a 500 Ω resistor. What is the voltage across it (in volts)? =
  24. 24.🔺 A current of 40 mA flows through a 250 Ω resistor. What is the voltage across it (in volts)? =
  25. 25.🔺 A current of 0.25 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
  26. 26.🔺 A current of 20 mA flows through a 400 Ω resistor. What is the voltage across it (in volts)? =
  27. 27.🔺 A current of 10 mA flows through a 500 Ω resistor. What is the voltage across it (in volts)? =
  28. 28.🔺 A current of 40 mA flows through a 500 Ω resistor. What is the voltage across it (in volts)? =
  29. 29.🔺 A current of 0.25 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  30. 30.🔺 A current of 50 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
  31. 31.🔺 A current of 3 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  32. 32.🔺 A current of 25 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
  33. 33.🔺 A current of 3 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =
  34. 34.🔺 A current of 50 mA flows through a 250 Ω resistor. What is the voltage across it (in volts)? =
  35. 35.🔺 A current of 10 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
  36. 36.🔺 A current of 0.5 A flows through a 10 Ω resistor. What is the voltage across it (in volts)? =
  37. 37.🔺 A current of 0.25 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
  38. 38.🔺 A current of 3 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
  39. 39.🔺 A current of 0.5 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
  40. 40.🔺 A current of 0.2 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =

Answer key

  1. 1.2
  2. 2.5
  3. 1.5
  4. 3.75
  5. 6.25
  6. 12.5
  7. 7.5
  8. 3.3
  9. 4.7
  10. 0.6
  11. 0.5
  12. 4
  13. 50
  14. 3
  15. V = I × R
  16. 37.5
  17. 9
  18. 2.5
  19. 16
  20. 20
  21. 3
  22. gets smaller
  23. 25
  24. 10
  25. 3.75
  26. 8
  27. 5
  28. 20
  29. 0.75
  30. 16.5
  31. 9
  32. 2.5
  33. 12
  34. 12.5
  35. 1
  36. 5
  37. 1.5
  38. 36
  39. 6
  40. 0.8

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