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Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 496 · 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 10 mA flows through a 250 Ω resistor. What is the voltage across it (in volts)? =
  2. 2.🌈 Which band is read first on a resistor? (a) the gold band (b) the widest gap (c) the one nearest an end (d) any band
  3. 3.🔺 A current of 40 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
  4. 4.Which of these is measured in amperes (A)? (a) power (b) voltage (c) the flow of charge (d) the push of a cell
  5. 5.🧮 Two equal 100 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  6. 6.📏 How many milliamperes (mA) is 1.94 A?
  7. 7.True or false: resistance is measured in volts (V). (a) False (b) True
  8. 8.🌈 In the resistor colour code, which number does red stand for?
  9. 9.🧮 A 1.6 V battery is joined to 10 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
  10. 10.🧩 Which part changes electrical energy into sound? (a) a capacitor (b) a resistor (c) a buzzer (d) a diode
  11. 11.True or false: on an LED, the round-side leg is the anode (+). (a) True (b) False
  12. 12.True or false: to use LED lamps saves electricity. (a) True (b) False
  13. 13.📏 How many ohms (Ω) is 0.7 kΩ?
  14. 14.🔺 A current of 0.2 A flows when 2 V is joined across a resistor. What is its resistance (in ohms)?
  15. 15.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V + I (c) P = V × I (d) P = I ÷ V
  16. 16.📏 Which unit measures voltage? (a) watt (W) (b) ampere (A) (c) ohm (Ω) (d) volt (V)
  17. 17.🔺 A current of 10 mA flows through a 400 Ω resistor. What is the voltage across it (in volts)? =
  18. 18.🧮 A 1.7 V battery is joined to 12 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  19. 19.🧮 A 2.75 V battery is joined to 3 Ω and 8 Ω resistors in series. What current flows (in amperes)? =
  20. 20.🌈 In the resistor colour code, which number does white stand for?
  21. 21.True or false: power is measured in volts (V). (a) True (b) False
  22. 22.🔺 A current of 0.1 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
  23. 23.💡 On an LED, is the round-side leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
  24. 24.🔺 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
  25. 25.🔺 A 5.5 V supply is joined across a 220 Ω resistor. What current flows (in milliamperes, mA)?
  26. 26.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) switch off empty rooms (d) use LED lamps
  27. 27.🌈 In the resistor colour code, which number does brown stand for?
  28. 28.🔺 A current of 50 mA flows through a 400 Ω resistor. What is the voltage across it (in volts)? =
  29. 29.🔺 A current of 40 mA flows through a 200 Ω resistor. What is the voltage across it (in volts)? =
  30. 30.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
  31. 31.🧮 Two equal 330 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  32. 32.What does a resistor do? (a) glows using little power (b) turns a fan or wheels (c) limits the current (d) boosts a small signal
  33. 33.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 190 Ω resistor? (a) brown-white-red (b) brown-white-black (c) white-brown-brown (d) brown-white-brown
  34. 34.Which of these is measured in ohms (Ω)? (a) power (b) current (c) the push of a cell (d) resistance
  35. 35.🔺 A current of 0.2 A flows when 0.8 V is joined across a resistor. What is its resistance (in ohms)?
  36. 36.📏 Which unit measures current? (a) watt (W) (b) volt (V) (c) ohm (Ω) (d) ampere (A)
  37. 37.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 19000 Ω resistor? (a) white-brown-orange (b) brown-white-orange (c) brown-white-red (d) brown-white-yellow
  38. 38.💡 A red LED (it uses 2 V) is joined with a 300 Ω resistor to an 8 V supply. What current flows (in mA)?
  39. 39.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
  40. 40.True or false: a capacitor stores a little charge. (a) True (b) False

Answer key

  1. 2.5
  2. the one nearest an end
  3. 13.2
  4. the flow of charge
  5. 50
  6. 1940
  7. False
  8. 2
  9. 0.1
  10. a buzzer
  11. True
  12. True
  13. 700
  14. 10
  15. P = V × I
  16. volt (V)
  17. 4
  18. 0.1
  19. 0.25
  20. 9
  21. False
  22. 0.6
  23. anode (+)
  24. I = V ÷ R
  25. 25
  26. use old filament bulbs
  27. 1
  28. 20
  29. 8
  30. anode (+)
  31. 165
  32. limits the current
  33. brown-white-brown
  34. resistance
  35. 4
  36. ampere (A)
  37. brown-white-orange
  38. 20
  39. True
  40. True

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