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Electronics Worksheet: Ohm’s Law – Current and Resistance

Electronics lesson 13: Ohm’s law: find current and resistance · Set 13 · 40 questions
TalentJR

Remember (Cover what you want): I = V ÷ R (amperes = volts ÷ ohms). R = V ÷ I (ohms = volts ÷ amperes); use amperes, not mA, in the formula. Example: 5 V and 25 mA (0.025 A) → R = 5 ÷ 0.025 = 200 Ω.

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  1. 1.🔺 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
  2. 2.🔺 A 3.75 V supply is joined across a 150 Ω resistor. What current flows (in milliamperes, mA)?
  3. 3.🔺 In the V-I-R triangle, how do we find R? (a) R = V × I (b) R = V + I (c) R = I ÷ V (d) R = V ÷ I
  4. 4.🔺 An 8.8 V supply is joined across a 220 Ω resistor. What current flows (in milliamperes, mA)?
  5. 5.🔺 A 4 V supply is joined across an 8 Ω resistor. What current flows (in amperes)? =
  6. 6.🔺 A current of 0.25 A flows when 1 V is joined across a resistor. What is its resistance (in ohms)?
  7. 7.🔺 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
  8. 8.🔺 A 1 V supply is joined across a 5 Ω resistor. What current flows (in amperes)? =
  9. 9.🔺 An 11 V supply is joined across a 220 Ω resistor. What current flows (in milliamperes, mA)?
  10. 10.🔺 A current of 1.5 A flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
  11. 11.🔺 A current of 3 A flows when 30 V is joined across a resistor. What is its resistance (in ohms)?
  12. 12.🔺 A current of 10 mA flows when 1.5 V is joined across a resistor. What is its resistance (in ohms)?
  13. 13.🔺 A 2.2 V supply is joined across a 220 Ω resistor. What current flows (in milliamperes, mA)?
  14. 14.🔺 A current of 3 A flows when 9 V is joined across a resistor. What is its resistance (in ohms)?
  15. 15.🔺 A current of 0.25 A flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
  16. 16.🔺 A current of 10 mA flows when 4.7 V is joined across a resistor. What is its resistance (in ohms)?
  17. 17.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) becomes zero (b) gets smaller (c) gets bigger (d) stays the same
  18. 18.🔺 A 9 V supply is joined across a 6 Ω resistor. What current flows (in amperes)? =
  19. 19.🔺 A 0.4 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
  20. 20.🔺 A 5 V supply is joined across a 100 Ω resistor. What current flows (in milliamperes, mA)?
  21. 21.🔺 A current of 0.25 A flows when 2.5 V is joined across a resistor. What is its resistance (in ohms)?
  22. 22.🔺 A 6 V supply is joined across a 150 Ω resistor. What current flows (in milliamperes, mA)?
  23. 23.🔺 A 6.6 V supply is joined across a 330 Ω resistor. What current flows (in milliamperes, mA)?
  24. 24.🔺 A current of 2.5 A flows when 25 V is joined across a resistor. What is its resistance (in ohms)?
  25. 25.🔺 A 3.3 V supply is joined across a 330 Ω resistor. What current flows (in milliamperes, mA)?
  26. 26.🔺 A 3 V supply is joined across a 120 Ω resistor. What current flows (in milliamperes, mA)?
  27. 27.🔺 A 2 V supply is joined across a 200 Ω resistor. What current flows (in milliamperes, mA)?
  28. 28.🔺 A current of 10 mA flows when 2 V is joined across a resistor. What is its resistance (in ohms)?
  29. 29.🔺 A 0.2 V supply is joined across a 2 Ω resistor. What current flows (in amperes)? =
  30. 30.🔺 A current of 10 mA flows when 2.2 V is joined across a resistor. What is its resistance (in ohms)?
  31. 31.🔺 A current of 20 mA flows when 9.4 V is joined across a resistor. What is its resistance (in ohms)?
  32. 32.🔺 A current of 10 mA flows when 1.2 V is joined across a resistor. What is its resistance (in ohms)?
  33. 33.🔺 A 3 V supply is joined across a 2 Ω resistor. What current flows (in amperes)? =
  34. 34.🔺 A current of 3 A flows when 36 V is joined across a resistor. What is its resistance (in ohms)?
  35. 35.🔺 A 12 V supply is joined across a 6 Ω resistor. What current flows (in amperes)? =
  36. 36.🔺 A current of 40 mA flows when 10 V is joined across a resistor. What is its resistance (in ohms)?
  37. 37.🔺 A current of 50 mA flows when 15 V is joined across a resistor. What is its resistance (in ohms)?
  38. 38.🔺 A current of 0.5 A flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
  39. 39.🔺 A current of 40 mA flows when 18.8 V is joined across a resistor. What is its resistance (in ohms)?
  40. 40.🔺 An 8 V supply is joined across a 200 Ω resistor. What current flows (in milliamperes, mA)?

Answer key

  1. V = I × R
  2. 25
  3. R = V ÷ I
  4. 40
  5. 0.5
  6. 4
  7. I = V ÷ R
  8. 0.2
  9. 50
  10. 2
  11. 10
  12. 150
  13. 10
  14. 3
  15. 12
  16. 470
  17. gets smaller
  18. 1.5
  19. 0.1
  20. 50
  21. 10
  22. 40
  23. 20
  24. 10
  25. 10
  26. 25
  27. 10
  28. 200
  29. 0.1
  30. 220
  31. 470
  32. 120
  33. 1.5
  34. 12
  35. 2
  36. 250
  37. 300
  38. 6
  39. 470
  40. 40

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