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Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 615 · 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.🧮 Two equal 1000 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  2. 2.🧮 Resistors of 22 Ω, 68 Ω and 33 Ω are joined in series. What is the total resistance (in ohms)?
  3. 3.🔺 In the V-I-R triangle, how do we find V? (a) V = I + R (b) V = R ÷ I (c) V = I × R (d) V = I ÷ R
  4. 4.🧩 Which part changes electrical energy into movement? (a) a fuse (b) an LED (c) a motor (d) a resistor
  5. 5.🧮 Resistors of 10 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
  6. 6.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
  7. 7.True or false: to use daylight to read wastes electricity. (a) True (b) False
  8. 8.🌈 A resistor has the colour bands yellow, white, red. What is its value in kilo-ohms (kΩ)? =
  9. 9.What does a capacitor do? (a) is a resistance knob (b) smooths a wobbly supply (c) lets current go one way (d) makes things spin
  10. 10.What does a motor do? (a) senses how hot it is (b) has coloured bands (c) turns a fan or wheels (d) smooths a wobbly supply
  11. 11.🧩 Which component turns a fan or wheels? (a) transistor (b) capacitor (c) motor (d) buzzer
  12. 12.🔺 A current of 10 mA flows through a 200 Ω resistor. What is the voltage across it (in volts)? =
  13. 13.📏 How many watts (W) is 0.6 kW?
  14. 14.Which of these is measured in watts (W)? (a) energy used each second (b) resistance (c) how much a part resists (d) the push of a cell
  15. 15.🔺 A current of 1 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
  16. 16.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = I ÷ V (d) P = V × I
  17. 17.🔺 A 10 V supply is joined across a 200 Ω resistor. What current flows (in milliamperes, mA)?
  18. 18.📏 How many ohms (Ω) is 6.1 kΩ?
  19. 19.Which of these wastes electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use LED lamps (d) use daylight to read
  20. 20.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
  21. 21.📏 How many amperes (A) is 2770 mA? =
  22. 22.🌈 A resistor has the colour bands white, brown, black. What is its value (in ohms)?
  23. 23.📏 How many watts (W) is 4.5 kW?
  24. 24.🔺 A current of 0.5 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
  25. 25.🌈 A resistor has the colour bands white, black, brown. What is its value (in ohms)?
  26. 26.⚡ A 3 W device works on 6 V. What current does it take (in amperes)? =
  27. 27.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) bigger (c) zero (d) stay the same
  28. 28.🔺 A current of 25 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
  29. 29.🌈 A gold fourth band on a resistor means the value may be off by … (a) 25 % (b) 0 % (c) 5 % (d) 50 %
  30. 30.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) use daylight to read
  31. 31.🔺 A 1.5 V supply is joined across a 3 Ω resistor. What current flows (in amperes)? =
  32. 32.🧮 Four equal 80 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  33. 33.Which of these is measured in volts (V)? (a) how much a part resists (b) current (c) voltage (d) energy used each second
  34. 34.True or false: resistance is measured in ohms (Ω). (a) False (b) True
  35. 35.True or false: a fuse smooths a wobbly supply. (a) True (b) False
  36. 36.🔺 A 20 V supply is joined across a 500 Ω resistor. What current flows (in milliamperes, mA)?
  37. 37.🔺 A 0.3 V supply is joined across a 3 Ω resistor. What current flows (in amperes)? =
  38. 38.🔺 A current of 40 mA flows when 4.8 V is joined across a resistor. What is its resistance (in ohms)?
  39. 39.🔺 A current of 1 A flows through a 20 Ω resistor. What is the voltage across it (in volts)? =
  40. 40.🧮 A 3 V battery is joined to 3 Ω and 3 Ω resistors in series. What current flows (in amperes)? =

Answer key

  1. 500
  2. 123
  3. V = I × R
  4. a motor
  5. 57
  6. 2.4
  7. False
  8. 4.9
  9. smooths a wobbly supply
  10. turns a fan or wheels
  11. motor
  12. 2
  13. 600
  14. energy used each second
  15. 6
  16. P = V × I
  17. 50
  18. 6100
  19. iron one shirt at a time
  20. an LED lamp
  21. 2.77
  22. 91
  23. 4500
  24. 4
  25. 900
  26. 0.5
  27. bigger
  28. 8.25
  29. 5 %
  30. use daylight to read
  31. 0.5
  32. 20
  33. voltage
  34. True
  35. False
  36. 40
  37. 0.1
  38. 120
  39. 20
  40. 0.5

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