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Electronics Worksheet: Ohm’s Law – Find the Voltage

Electronics lesson 12: Ohm’s law: find the voltage · Set 28 · 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 0.5 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =
  2. 2.🔺 A current of 0.2 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
  3. 3.🔺 A current of 50 mA flows through a 120 Ω resistor. What is the voltage across it (in volts)? =
  4. 4.🔺 A current of 25 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
  5. 5.🔺 In the V-I-R triangle, how do we find R? (a) R = V × I (b) R = I ÷ V (c) R = V ÷ I (d) R = V + I
  6. 6.🔺 In the V-I-R triangle, how do we find I? (a) I = V × R (b) I = V ÷ R (c) I = V + R (d) I = R ÷ V
  7. 7.🔺 A current of 20 mA flows through a 300 Ω resistor. What is the voltage across it (in volts)? =
  8. 8.🔺 In the V-I-R triangle, how do we find V? (a) V = R ÷ I (b) V = I + R (c) V = I × R (d) V = I ÷ R
  9. 9.🔺 A current of 0.1 A flows through a 20 Ω resistor. What is the voltage across it (in volts)? =
  10. 10.🔺 A current of 50 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
  11. 11.🔺 A current of 3 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  12. 12.🔺 A current of 50 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
  13. 13.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) stays the same (b) gets smaller (c) becomes zero (d) gets bigger
  14. 14.🔺 A current of 10 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
  15. 15.🔺 A current of 50 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
  16. 16.🔺 A current of 0.2 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
  17. 17.🔺 A current of 25 mA flows through a 500 Ω resistor. What is the voltage across it (in volts)? =
  18. 18.🔺 A current of 25 mA flows through a 300 Ω resistor. What is the voltage across it (in volts)? =
  19. 19.🔺 A current of 0.1 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
  20. 20.🔺 A current of 2.5 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
  21. 21.🔺 A current of 0.5 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
  22. 22.🔺 A current of 2 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
  23. 23.🔺 A current of 25 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
  24. 24.🔺 A current of 20 mA flows through a 120 Ω resistor. What is the voltage across it (in volts)? =
  25. 25.🔺 A current of 2 A flows through a 20 Ω resistor. What is the voltage across it (in volts)? =
  26. 26.🔺 A current of 20 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
  27. 27.🔺 A current of 0.25 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
  28. 28.🔺 A current of 0.2 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
  29. 29.🔺 A current of 2.5 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
  30. 30.🔺 A current of 25 mA flows through a 120 Ω resistor. What is the voltage across it (in volts)? =
  31. 31.🔺 A current of 2 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
  32. 32.🔺 A current of 2 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
  33. 33.🔺 A current of 10 mA flows through a 250 Ω resistor. What is the voltage across it (in volts)? =
  34. 34.🔺 A current of 1.5 A flows through a 6 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 25 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
  37. 37.🔺 A current of 0.25 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  38. 38.🔺 A current of 40 mA flows through a 500 Ω resistor. What is the voltage across it (in volts)? =
  39. 39.🔺 A current of 0.5 A flows through a 10 Ω resistor. What is the voltage across it (in volts)? =
  40. 40.🔺 A current of 2.5 A flows through a 20 Ω resistor. What is the voltage across it (in volts)? =

Answer key

  1. 2
  2. 1.2
  3. 6
  4. 2.5
  5. R = V ÷ I
  6. I = V ÷ R
  7. 6
  8. V = I × R
  9. 2
  10. 5
  11. 9
  12. 7.5
  13. gets smaller
  14. 4.7
  15. 23.5
  16. 1.6
  17. 12.5
  18. 7.5
  19. 1.2
  20. 30
  21. 2.5
  22. 16
  23. 3.75
  24. 2.4
  25. 40
  26. 9.4
  27. 0.5
  28. 3
  29. 20
  30. 3
  31. 30
  32. 10
  33. 2.5
  34. 9
  35. 1
  36. 11.75
  37. 0.75
  38. 20
  39. 5
  40. 50

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