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Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 364 · 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.📏 Voltmeter or ammeter: which one is joined in series? (a) ammeter (b) voltmeter
  2. 2.🧮 Adding another resistor in series makes the total resistance … (a) zero (b) smaller (c) bigger (d) stay the same
  3. 3.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 770 Ω resistor? (a) violet-violet-red (b) violet-violet-brown (c) violet-violet-black (d) violet-grey-brown
  4. 4.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 5100 Ω resistor? (a) green-brown-red (b) green-brown-orange (c) green-brown-brown (d) brown-green-red
  5. 5.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 220 Ω resistor? (a) red-red-red (b) red-orange-brown (c) red-red-brown (d) red-red-black
  6. 6.🧮 A 1 V battery is joined to 6 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
  7. 7.📏 How many kilowatts (kW) is 1000 W? =
  8. 8.🧮 Two resistors in parallel give a total that is … (a) more than either one (b) less than either one (c) their sum (d) always zero
  9. 9.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  10. 10.🌈 A gold fourth band on a resistor means the value may be off by … (a) 25 % (b) 0 % (c) 5 % (d) 50 %
  11. 11.💡 A red LED (it uses 2 V) is joined with a 150 Ω resistor to a 5 V supply. What current flows (in mA)?
  12. 12.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
  13. 13.🔺 A current of 10 mA flows through a 400 Ω resistor. What is the voltage across it (in volts)? =
  14. 14.🌈 A resistor has the colour bands brown, black, orange. What is its value in kilo-ohms (kΩ)? =
  15. 15.🔺 A current of 25 mA flows through a 200 Ω resistor. What is the voltage across it (in volts)? =
  16. 16.🔺 A current of 0.25 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
  17. 17.🧮 Resistors of 22 Ω, 470 Ω, 330 Ω and 10 Ω are joined in series. What is the total resistance (in ohms)?
  18. 18.🧩 Which component stores a little charge? (a) diode (b) motor (c) capacitor (d) thermistor
  19. 19.🔺 A current of 20 mA flows when 6 V is joined across a resistor. What is its resistance (in ohms)?
  20. 20.🌈 In the resistor colour code, which number does grey stand for?
  21. 21.🌈 A resistor has the colour bands orange, blue, orange. What is its value (in ohms)?
  22. 22.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V × I (d) P = V + I
  23. 23.📏 Voltmeter or ammeter: which one is joined across a part? (a) voltmeter (b) ammeter
  24. 24.🌈 A resistor has the colour bands green, red, orange. What is its value (in ohms)?
  25. 25.📏 How many ohms (Ω) is 4.5 kΩ?
  26. 26.🧩 Which component lets current go one way? (a) transistor (b) diode (c) LDR (d) LED
  27. 27.🔺 A current of 10 mA flows through a 500 Ω resistor. What is the voltage across it (in volts)? =
  28. 28.🧩 Which component beeps for an alarm? (a) fuse (b) LED (c) thermistor (d) buzzer
  29. 29.💡 An LED is joined to a 9 V battery through a 470 Ω resistor; its long leg goes to the + side and its short leg to the − side. What happens? (a) does not light (b) lights up (c) may burn out
  30. 30.🔺 A current of 0.25 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
  31. 31.🧮 Resistors of 47 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
  32. 32.📏 How many kilo-ohms (kΩ) is 9700 Ω? =
  33. 33.🧮 Two equal 20 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  34. 34.Which of these is measured in amperes (A)? (a) the flow of charge (b) power (c) resistance (d) voltage
  35. 35.⚡ A device works on 5 V and takes 0.1 A. What is its power (in watts)? =
  36. 36.🌈 A resistor has the colour bands grey, green, red. What is its value in kilo-ohms (kΩ)? =
  37. 37.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
  38. 38.🌈 A resistor has the colour bands brown, blue, red. What is its value in kilo-ohms (kΩ)? =
  39. 39.🔺 In the V-I-R triangle, how do we find R? (a) R = I ÷ V (b) R = V + I (c) R = V × I (d) R = V ÷ I
  40. 40.⚡ A 0.9 W device works on 9 V. What current does it take (in amperes)? =

Answer key

  1. ammeter
  2. bigger
  3. violet-violet-brown
  4. green-brown-red
  5. red-red-brown
  6. 0.1
  7. 1
  8. less than either one
  9. 3
  10. 5 %
  11. 20
  12. 306
  13. 4
  14. 10
  15. 5
  16. 1.5
  17. 832
  18. capacitor
  19. 300
  20. 8
  21. 36000
  22. P = V × I
  23. voltmeter
  24. 52000
  25. 4500
  26. diode
  27. 5
  28. buzzer
  29. lights up
  30. 2
  31. 67
  32. 9.7
  33. 10
  34. the flow of charge
  35. 0.5
  36. 8.5
  37. 20
  38. 1.6
  39. R = V ÷ I
  40. 0.1

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