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Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 179 · 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.

NameDateTime takenScore ___ / 40
  1. 1.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
  2. 2.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark an 84 Ω resistor? (a) yellow-grey-black (b) white-yellow-black (c) grey-yellow-black (d) grey-yellow-brown
  3. 3.🔺 An 8 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
  4. 4.📏 How many kilo-ohms (kΩ) is 1400 Ω? =
  5. 5.Which of these is measured in amperes (A)? (a) the push of a cell (b) current (c) energy used each second (d) voltage
  6. 6.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 720 Ω resistor? (a) red-violet-brown (b) violet-red-red (c) violet-red-brown (d) violet-red-black
  7. 7.Which of these is measured in volts (V)? (a) energy used each second (b) the push of a cell (c) current (d) resistance
  8. 8.🔺 A current of 25 mA flows through a 220 Ω resistor. What is the voltage across it (in volts)? =
  9. 9.🌈 In the resistor colour code, which number does yellow stand for?
  10. 10.⚡ Power tells us … (a) the length of a wire (b) the colour of light (c) the size of a cell (d) energy used each second
  11. 11.True or false: energy used each second is measured in watts (W). (a) True (b) False
  12. 12.🔺 A current of 0.25 A flows through a 10 Ω resistor. What is the voltage across it (in volts)? =
  13. 13.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) use daylight to read (d) unplug idle chargers
  14. 14.🔺 A current of 40 mA flows through a 400 Ω resistor. What is the voltage across it (in volts)? =
  15. 15.💡 A red LED (it uses 2 V) is joined with a 200 Ω resistor to a 5 V supply. What current flows (in mA)?
  16. 16.⚡ A device works on 9 V and takes 3 A. What is its power (in watts)? =
  17. 17.🔺 A current of 40 mA flows through a 120 Ω resistor. What is the voltage across it (in volts)? =
  18. 18.🌈 A resistor has the colour bands red, yellow, orange. What is its value (in ohms)?
  19. 19.🧮 Resistors of 22 Ω, 220 Ω and 10 Ω are joined in series. What is the total resistance (in ohms)?
  20. 20.True or false: the ammeter is joined across a part. (a) True (b) False
  21. 21.🔺 In the V-I-R triangle, how do we find I? (a) I = V + R (b) I = V × R (c) I = V ÷ R (d) I = R ÷ V
  22. 22.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  23. 23.🧩 Which component lets current go one way? (a) motor (b) capacitor (c) transistor (d) diode
  24. 24.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
  25. 25.⚡ A 0.75 W device works on 1.5 V. What current does it take (in amperes)? =
  26. 26.📏 Voltmeter or ammeter: which one is joined across a part? (a) ammeter (b) voltmeter
  27. 27.🔺 A 20 V supply is joined across a 500 Ω resistor. What current flows (in milliamperes, mA)?
  28. 28.🌈 In the resistor colour code, which number does black stand for?
  29. 29.📏 How many amperes (A) is 430 mA? =
  30. 30.🔺 A 45 V supply is joined across a 15 Ω resistor. What current flows (in amperes)? =
  31. 31.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  32. 32.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 5500 Ω resistor? (a) green-blue-red (b) green-green-brown (c) green-green-red (d) green-green-orange
  33. 33.🔺 A current of 0.2 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  34. 34.🔺 A current of 10 mA flows through a 500 Ω resistor. What is the voltage across it (in volts)? =
  35. 35.📏 How many amperes (A) is 1960 mA? =
  36. 36.🔺 A 12.5 V supply is joined across a 250 Ω resistor. What current flows (in milliamperes, mA)?
  37. 37.🧮 A 6.5 V battery is joined to 10 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  38. 38.🔺 A current of 10 mA flows when 3.3 V is joined across a resistor. What is its resistance (in ohms)?
  39. 39.📏 Which unit measures how much a part resists? (a) volt (V) (b) ampere (A) (c) ohm (Ω) (d) watt (W)
  40. 40.🔺 A 10 V supply is joined across a 200 Ω resistor. What current flows (in milliamperes, mA)?

Answer key

  1. 230
  2. grey-yellow-black
  3. 2
  4. 1.4
  5. current
  6. violet-red-brown
  7. the push of a cell
  8. 5.5
  9. 4
  10. energy used each second
  11. True
  12. 2.5
  13. run fans in empty rooms
  14. 16
  15. 15
  16. 27
  17. 4.8
  18. 24000
  19. 252
  20. False
  21. I = V ÷ R
  22. 0.2
  23. diode
  24. 0.3
  25. 0.5
  26. voltmeter
  27. 40
  28. 0
  29. 0.43
  30. 3
  31. 1.5
  32. green-green-red
  33. 0.6
  34. 5
  35. 1.96
  36. 50
  37. 0.5
  38. 330
  39. ohm (Ω)
  40. 50

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