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Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 416 · 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 resistor has the colour bands orange, blue, red. What is its value (in ohms)?
  2. 2.🧩 A capacitor in a circuit can … (a) spin a wheel (b) store charge briefly (c) make light (d) measure heat
  3. 3.🔺 A 2 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
  4. 4.🧩 Which component beeps for an alarm? (a) resistor (b) buzzer (c) thermistor (d) capacitor
  5. 5.🔺 A current of 0.1 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  6. 6.🔺 A 6 V supply is joined across a 3 Ω resistor. What current flows (in amperes)? =
  7. 7.💡 What does LED stand for? (a) large electric dial (b) low energy device (c) light energy dial (d) light-emitting diode
  8. 8.🔺 A current of 10 mA flows through a 200 Ω resistor. What is the voltage across it (in volts)? =
  9. 9.🔺 A 20 V supply is joined across a 500 Ω resistor. What current flows (in milliamperes, mA)?
  10. 10.⚡ A device works on 24 V and takes 0.2 A. What is its power (in watts)? =
  11. 11.🧩 Which component turns a fan or wheels? (a) capacitor (b) buzzer (c) transistor (d) motor
  12. 12.🧮 A 33 Ω resistor is joined in series with two equal 330 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  13. 13.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  14. 14.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
  15. 15.What does a diode do? (a) limits the current (b) senses how bright it is (c) stores a little charge (d) lets current go one way
  16. 16.🌈 In the resistor colour code, which number does green stand for?
  17. 17.True or false: to use daylight to read saves electricity. (a) False (b) True
  18. 18.True or false: the ammeter is joined in series. (a) False (b) True
  19. 19.🔺 In the V-I-R triangle, how do we find I? (a) I = R ÷ V (b) I = V × R (c) I = V ÷ R (d) I = V + R
  20. 20.🧮 Two resistors in parallel give a total that is … (a) less than either one (b) their sum (c) more than either one (d) always zero
  21. 21.🧮 A 20 Ω resistor is joined in series with two equal 200 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  22. 22.🧮 Resistors of 150 Ω, 470 Ω, 150 Ω and 10 Ω are joined in series. What is the total resistance (in ohms)?
  23. 23.🧩 Which part changes electrical energy into sound? (a) a capacitor (b) a buzzer (c) a diode (d) a resistor
  24. 24.🔺 A current of 1 A flows through a 10 Ω resistor. What is the voltage across it (in volts)? =
  25. 25.⚡ A 9 W device works on 6 V. What current does it take (in amperes)? =
  26. 26.🔺 A 5.5 V supply is joined across a 220 Ω resistor. What current flows (in milliamperes, mA)?
  27. 27.🧮 A 150 Ω resistor is joined in series with two equal 470 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
  28. 28.📏 Which unit measures energy used each second? (a) ampere (A) (b) watt (W) (c) ohm (Ω) (d) volt (V)
  29. 29.💡 A red LED (it uses 2 V) is joined with a 200 Ω resistor to a 6 V supply. What current flows (in mA)?
  30. 30.🔺 A 2 V supply is joined across a 20 Ω resistor. What current flows (in amperes)? =
  31. 31.📏 How many ohms make 1 kilo-ohm (kΩ)? (a) 100 (b) 1024 (c) 1000 (d) 10
  32. 32.🔺 A current of 1 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
  33. 33.🔺 A current of 50 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
  34. 34.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  35. 35.🔺 A 10 V supply is joined across a 5 Ω resistor. What current flows (in amperes)? =
  36. 36.🔺 A current of 1.5 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
  37. 37.🔺 A current of 40 mA flows through a 300 Ω resistor. What is the voltage across it (in volts)? =
  38. 38.True or false: resistance is measured in volts (V). (a) True (b) False
  39. 39.🌈 A resistor has the colour bands red, orange, orange. What is its value (in ohms)?
  40. 40.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?

Answer key

  1. 3600
  2. store charge briefly
  3. 0.5
  4. buzzer
  5. 0.3
  6. 2
  7. light-emitting diode
  8. 2
  9. 40
  10. 4.8
  11. motor
  12. 198
  13. 0.75
  14. 2.4
  15. lets current go one way
  16. 5
  17. True
  18. True
  19. I = V ÷ R
  20. less than either one
  21. 120
  22. 780
  23. a buzzer
  24. 10
  25. 1.5
  26. 25
  27. 385
  28. watt (W)
  29. 20
  30. 0.1
  31. 1000
  32. 12
  33. 23.5
  34. 115
  35. 2
  36. 9
  37. 12
  38. False
  39. 23000
  40. 920

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