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Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 667 · 40 questions
TalentJR

Remember (Find the topic, use the formula): Find the topic and the formula: V = I × R, I = V ÷ R, R = V ÷ I, P = V × I, units = W × h ÷ 1000. Change mA to A and kΩ to Ω before using a formula. Check: put your answer back into the formula.

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  1. 1.🔺 A current of 0.2 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
  2. 2.🧮 Three equal 15 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  3. 3.🔺 A current of 40 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
  4. 4.🔺 A current of 2.5 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
  5. 5.True or false: a fuse glows using little power. (a) True (b) False
  6. 6.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
  7. 7.🔺 A current of 10 mA flows through a 120 Ω resistor. What is the voltage across it (in volts)? =
  8. 8.🌈 A resistor has the colour bands orange, violet, red. What is its value (in ohms)?
  9. 9.🔺 A current of 50 mA flows when 5 V is joined across a resistor. What is its resistance (in ohms)?
  10. 10.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
  11. 11.🔺 A current of 20 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
  12. 12.⚡ A device works on 9 V and takes 1.5 A. What is its power (in watts)? =
  13. 13.True or false: a fuse smooths a wobbly supply. (a) False (b) True
  14. 14.🧮 A 3.25 V battery is joined to 5 Ω and 8 Ω resistors in series. What current flows (in amperes)? =
  15. 15.🔺 A current of 50 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
  16. 16.⚡ A 4.8 W device works on 24 V. What current does it take (in amperes)? =
  17. 17.🔺 A current of 0.1 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =
  18. 18.🌈 Which band is read first on a resistor? (a) the widest gap (b) any band (c) the one nearest an end (d) the gold band
  19. 19.🧩 Which component boosts a small signal? (a) capacitor (b) potentiometer (c) LDR (d) transistor
  20. 20.📏 Voltmeter or ammeter: which one is joined in series? (a) ammeter (b) voltmeter
  21. 21.True or false: the push of a cell is measured in volts (V). (a) False (b) True
  22. 22.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = V × I (d) P = I ÷ V
  23. 23.📏 In the water-pipe picture of a circuit, current is like … (a) the pipe colour (b) the water pressure (c) the flow of water (d) a narrow pipe
  24. 24.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
  25. 25.🔺 A 0.8 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
  26. 26.💡 On an LED, is the round-side leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
  27. 27.📏 How many amperes (A) is 1580 mA? =
  28. 28.🧩 Which part changes electrical energy into sound? (a) a diode (b) a resistor (c) a capacitor (d) a buzzer
  29. 29.🔺 A current of 10 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
  30. 30.🔺 A current of 20 mA flows through a 200 Ω resistor. What is the voltage across it (in volts)? =
  31. 31.🧮 Resistors of 10 Ω, 47 Ω, 50 Ω and 470 Ω are joined in series. What is the total resistance (in ohms)?
  32. 32.⚡ A device works on 12 V and takes 1.5 A. What is its power (in watts)? =
  33. 33.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) bigger (c) stay the same (d) zero
  34. 34.💡 A red LED uses 2 V and should get 10 mA. It runs from a 12 V supply. What resistor (in ohms) is needed in series?
  35. 35.🧮 Two equal 10 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  36. 36.🔺 A current of 0.1 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  37. 37.🔺 A 1 V supply is joined across a 2 Ω resistor. What current flows (in amperes)? =
  38. 38.🧮 Resistors of 10 Ω, 47 Ω, 22 Ω and 470 Ω are joined in series. What is the total resistance (in ohms)?
  39. 39.🌈 A resistor has the colour bands green, black, brown. What is its value (in ohms)?
  40. 40.🧩 Which component turns a fan or wheels? (a) capacitor (b) motor (c) transistor (d) LED

Answer key

  1. 2.4
  2. 5
  3. 6
  4. 12.5
  5. False
  6. 1.5
  7. 1.2
  8. 3700
  9. 100
  10. 420
  11. 2
  12. 13.5
  13. False
  14. 0.25
  15. 23.5
  16. 0.2
  17. 0.4
  18. the one nearest an end
  19. transistor
  20. ammeter
  21. True
  22. P = V × I
  23. the flow of water
  24. anode (+)
  25. 0.2
  26. anode (+)
  27. 1.58
  28. a buzzer
  29. 3.3
  30. 4
  31. 577
  32. 18
  33. bigger
  34. 1000
  35. 5
  36. 0.3
  37. 0.5
  38. 549
  39. 500
  40. motor

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