← Ohm’s law: find current and resistance lesson New set →

Electronics Worksheet: Ohm’s Law – Current and Resistance

Electronics lesson 13: Ohm’s law: find current and resistance · Set 141 · 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.

NameDateTime takenScore ___ / 40
  1. 1.🔺 A 0.8 V supply is joined across an 8 Ω resistor. What current flows (in amperes)? =
  2. 2.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) becomes zero (b) gets bigger (c) stays the same (d) gets smaller
  3. 3.🔺 An 8.25 V supply is joined across a 330 Ω resistor. What current flows (in milliamperes, mA)?
  4. 4.🔺 A 1 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
  5. 5.🔺 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
  6. 6.🔺 A 7.5 V supply is joined across a 150 Ω resistor. What current flows (in milliamperes, mA)?
  7. 7.🔺 In the V-I-R triangle, how do we find V? (a) V = I ÷ R (b) V = I + R (c) V = I × R (d) V = R ÷ I
  8. 8.🔺 In the V-I-R triangle, how do we find I? (a) I = V × R (b) I = V ÷ R (c) I = R ÷ V (d) I = V + R
  9. 9.🔺 A current of 25 mA flows when 11.75 V is joined across a resistor. What is its resistance (in ohms)?
  10. 10.🔺 A current of 2.5 A flows when 5 V is joined across a resistor. What is its resistance (in ohms)?
  11. 11.🔺 A 20 V supply is joined across a 500 Ω resistor. What current flows (in milliamperes, mA)?
  12. 12.🔺 A 45 V supply is joined across a 15 Ω resistor. What current flows (in amperes)? =
  13. 13.🔺 A 4.5 V supply is joined across a 3 Ω resistor. What current flows (in amperes)? =
  14. 14.🔺 A 2 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
  15. 15.🔺 A 6 V supply is joined across a 120 Ω resistor. What current flows (in milliamperes, mA)?
  16. 16.🔺 A 5 V supply is joined across a 250 Ω resistor. What current flows (in milliamperes, mA)?
  17. 17.🔺 A current of 0.25 A flows when 2.5 V is joined across a resistor. What is its resistance (in ohms)?
  18. 18.🔺 A current of 10 mA flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
  19. 19.🔺 A current of 40 mA flows when 8.8 V is joined across a resistor. What is its resistance (in ohms)?
  20. 20.🔺 A current of 50 mA flows when 15 V is joined across a resistor. What is its resistance (in ohms)?
  21. 21.🔺 A 15 V supply is joined across a 10 Ω resistor. What current flows (in amperes)? =
  22. 22.🔺 A current of 10 mA flows when 2 V is joined across a resistor. What is its resistance (in ohms)?
  23. 23.🔺 A 0.6 V supply is joined across a 6 Ω resistor. What current flows (in amperes)? =
  24. 24.🔺 A 9 V supply is joined across a 3 Ω resistor. What current flows (in amperes)? =
  25. 25.🔺 A 5 V supply is joined across a 20 Ω resistor. What current flows (in amperes)? =
  26. 26.🔺 A current of 0.2 A flows when 1.2 V is joined across a resistor. What is its resistance (in ohms)?
  27. 27.🔺 A 3.75 V supply is joined across a 15 Ω resistor. What current flows (in amperes)? =
  28. 28.🔺 A current of 1 A flows when 2 V is joined across a resistor. What is its resistance (in ohms)?
  29. 29.🔺 A 7.5 V supply is joined across a 5 Ω resistor. What current flows (in amperes)? =
  30. 30.🔺 A current of 50 mA flows when 6 V is joined across a resistor. What is its resistance (in ohms)?
  31. 31.🔺 A current of 25 mA flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
  32. 32.🔺 A 7.5 V supply is joined across a 3 Ω resistor. What current flows (in amperes)? =
  33. 33.🔺 A 15 V supply is joined across a 300 Ω resistor. What current flows (in milliamperes, mA)?
  34. 34.🔺 A current of 50 mA flows when 23.5 V is joined across a resistor. What is its resistance (in ohms)?
  35. 35.🔺 A current of 50 mA flows when 7.5 V is joined across a resistor. What is its resistance (in ohms)?
  36. 36.🔺 A 3 V supply is joined across a 15 Ω resistor. What current flows (in amperes)? =
  37. 37.🔺 A 1 V supply is joined across a 10 Ω resistor. What current flows (in amperes)? =
  38. 38.🔺 A 2 V supply is joined across a 10 Ω resistor. What current flows (in amperes)? =
  39. 39.🔺 A 6 V supply is joined across a 3 Ω resistor. What current flows (in amperes)? =
  40. 40.🔺 A 5 V supply is joined across a 100 Ω resistor. What current flows (in milliamperes, mA)?

Answer key

  1. 0.1
  2. gets smaller
  3. 25
  4. 0.25
  5. R = V ÷ I
  6. 50
  7. V = I × R
  8. I = V ÷ R
  9. 470
  10. 2
  11. 40
  12. 3
  13. 1.5
  14. 0.5
  15. 50
  16. 20
  17. 10
  18. 300
  19. 220
  20. 300
  21. 1.5
  22. 200
  23. 0.1
  24. 3
  25. 0.25
  26. 6
  27. 0.25
  28. 2
  29. 1.5
  30. 120
  31. 120
  32. 2.5
  33. 50
  34. 470
  35. 150
  36. 0.2
  37. 0.1
  38. 0.2
  39. 2
  40. 50

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids