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Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 65 · 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.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
  2. 2.Which of these is measured in ohms (Ω)? (a) voltage (b) power (c) resistance (d) the flow of charge
  3. 3.🔺 A 2.2 V supply is joined across a 220 Ω resistor. What current flows (in milliamperes, mA)?
  4. 4.🌈 In the resistor colour code, which number does grey stand for?
  5. 5.📏 Which unit measures how much a part resists? (a) ampere (A) (b) watt (W) (c) volt (V) (d) ohm (Ω)
  6. 6.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
  7. 7.🧮 A 2.75 V battery is joined to 5 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
  8. 8.📏 How many kilowatts (kW) is 2450 W? =
  9. 9.📏 How many kilowatts (kW) is 3000 W? =
  10. 10.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  11. 11.💡 An LED is joined to a 9 V battery through a 1000 Ω resistor; its long leg goes to the − side and its short leg to the + side. What happens? (a) may burn out (b) lights up (c) does not light
  12. 12.🧮 Five equal 50 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  13. 13.⚡ A device works on 6 V and takes 1 A. What is its power (in watts)? =
  14. 14.🔺 A 3.3 V supply is joined across a 330 Ω resistor. What current flows (in milliamperes, mA)?
  15. 15.True or false: a diode lets current go one way. (a) False (b) True
  16. 16.⚡ A 0.375 W device works on 1.5 V. What current does it take (in amperes)? =
  17. 17.🔺 A current of 25 mA flows through a 250 Ω resistor. What is the voltage across it (in volts)? =
  18. 18.📏 How many kilo-ohms (kΩ) is 1500 Ω? =
  19. 19.Which of these is measured in amperes (A)? (a) how much a part resists (b) resistance (c) the push of a cell (d) the flow of charge
  20. 20.🌈 A gold fourth band on a resistor means the value may be off by … (a) 25 % (b) 0 % (c) 50 % (d) 5 %
  21. 21.True or false: on an LED, the round-side leg is the anode (+). (a) False (b) True
  22. 22.💡 On an LED, is the round-side leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
  23. 23.Which of these is measured in watts (W)? (a) current (b) power (c) the push of a cell (d) the flow of charge
  24. 24.📏 Which unit measures the push of a cell? (a) volt (V) (b) ohm (Ω) (c) ampere (A) (d) watt (W)
  25. 25.True or false: a buzzer makes a beeping sound. (a) False (b) True
  26. 26.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  27. 27.💡 An LED is joined to a 5 V battery through a 220 Ω resistor; the leg next to the flat edge of its rim goes to the − side. What happens? (a) does not light (b) lights up (c) may burn out
  28. 28.🧮 Two equal 200 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  29. 29.🔺 A current of 25 mA flows when 2.5 V is joined across a resistor. What is its resistance (in ohms)?
  30. 30.🧮 Two equal 1000 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  31. 31.🧮 Five equal 500 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  32. 32.🔺 A current of 2.5 A flows when 20 V is joined across a resistor. What is its resistance (in ohms)?
  33. 33.🧮 Two equal 10 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  34. 34.🔺 A current of 20 mA flows through a 400 Ω resistor. What is the voltage across it (in volts)? =
  35. 35.⚡ A 2.25 W device works on 1.5 V. What current does it take (in amperes)? =
  36. 36.🔺 A current of 3 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
  37. 37.🧮 A 2.75 V battery is joined to 6 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  38. 38.🔺 A current of 25 mA flows through a 500 Ω resistor. What is the voltage across it (in volts)? =
  39. 39.📏 Which unit measures voltage? (a) watt (W) (b) volt (V) (c) ampere (A) (d) ohm (Ω)
  40. 40.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 27000 Ω resistor? (a) red-violet-orange (b) violet-red-orange (c) red-violet-red (d) red-violet-yellow

Answer key

  1. an LED lamp
  2. resistance
  3. 10
  4. 8
  5. ohm (Ω)
  6. 0.75
  7. 0.25
  8. 2.45
  9. 3
  10. 0.5
  11. does not light
  12. 10
  13. 6
  14. 10
  15. True
  16. 0.25
  17. 6.25
  18. 1.5
  19. the flow of charge
  20. 5 %
  21. True
  22. anode (+)
  23. power
  24. volt (V)
  25. True
  26. 24
  27. lights up
  28. 100
  29. 100
  30. 500
  31. 100
  32. 8
  33. 5
  34. 8
  35. 1.5
  36. 6
  37. 0.25
  38. 12.5
  39. volt (V)
  40. red-violet-orange

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