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Electronics Worksheet: Components and Ohm’s Law Test

Electronics lesson 20: Part 2 test: components and Ohm’s law · Set 624 · 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 gold fourth band on a resistor means the value may be off by … (a) 50 % (b) 0 % (c) 25 % (d) 5 %
  2. 2.🔺 A 6 V supply is joined across a 120 Ω resistor. What current flows (in milliamperes, mA)?
  3. 3.🔺 In the V-I-R triangle, how do we find V? (a) V = R ÷ I (b) V = I ÷ R (c) V = I × R (d) V = I + R
  4. 4.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  5. 5.True or false: the push of a cell is measured in amperes (A). (a) False (b) True
  6. 6.🔺 A current of 0.1 A flows through a 10 Ω resistor. What is the voltage across it (in volts)? =
  7. 7.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
  8. 8.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  9. 9.💡 On an LED, is the leg by the flat edge the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
  10. 10.🌈 A resistor has the colour bands blue, red, red. What is its value in kilo-ohms (kΩ)? =
  11. 11.True or false: the voltmeter is joined across a part. (a) False (b) True
  12. 12.True or false: the voltmeter measures current. (a) True (b) False
  13. 13.🧮 Resistors of 50 Ω, 220 Ω, 22 Ω and 50 Ω are joined in series. What is the total resistance (in ohms)?
  14. 14.💡 On an LED, is the shorter leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
  15. 15.🔺 A 4 V supply is joined across a 2 Ω resistor. What current flows (in amperes)? =
  16. 16.💡 On an LED, is the round-side leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
  17. 17.🔺 A 30 V supply is joined across a 10 Ω resistor. What current flows (in amperes)? =
  18. 18.⚡ A 3 W device works on 3 V. What current does it take (in amperes)? =
  19. 19.True or false: the voltmeter measures voltage. (a) True (b) False
  20. 20.🔺 A 7.5 V supply is joined across a 150 Ω resistor. What current flows (in milliamperes, mA)?
  21. 21.🔺 A current of 1 A flows when 4 V is joined across a resistor. What is its resistance (in ohms)?
  22. 22.🔺 A 60 V supply is joined across a 20 Ω resistor. What current flows (in amperes)? =
  23. 23.🔺 A current of 10 mA flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
  24. 24.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  25. 25.🔺 A current of 10 mA flows when 4 V is joined across a resistor. What is its resistance (in ohms)?
  26. 26.🔺 A current of 40 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
  27. 27.True or false: a motor makes things spin. (a) False (b) True
  28. 28.🌈 Which band is read first on a resistor? (a) any band (b) the widest gap (c) the one nearest an end (d) the gold band
  29. 29.💡 An LED is joined to a 6 V battery through a 1000 Ω resistor; the leg next to the flat edge of its rim goes to the − side. What happens? (a) does not light (b) may burn out (c) lights up
  30. 30.🧮 Two resistors in parallel give a total that is … (a) more than either one (b) their sum (c) always zero (d) less than either one
  31. 31.Which of these is measured in ohms (Ω)? (a) energy used each second (b) the push of a cell (c) resistance (d) current
  32. 32.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  33. 33.📏 Voltmeter or ammeter: which one measures voltage? (a) ammeter (b) voltmeter
  34. 34.🧮 Adding another resistor in series makes the total resistance … (a) stay the same (b) zero (c) bigger (d) smaller
  35. 35.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
  36. 36.🔺 A current of 0.2 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
  37. 37.Which of these is measured in volts (V)? (a) the push of a cell (b) resistance (c) how much a part resists (d) energy used each second
  38. 38.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  39. 39.What does a resistor do? (a) senses how hot it is (b) glows using little power (c) makes a beeping sound (d) has coloured bands
  40. 40.🧮 A 4 V battery is joined to 10 Ω and 10 Ω resistors in series. What current flows (in amperes)? =

Answer key

  1. 5 %
  2. 50
  3. V = I × R
  4. 440
  5. False
  6. 1
  7. 750
  8. 0.5
  9. cathode (−)
  10. 6.2
  11. True
  12. False
  13. 342
  14. cathode (−)
  15. 2
  16. anode (+)
  17. 3
  18. 1
  19. True
  20. 50
  21. 4
  22. 3
  23. 300
  24. 3
  25. 400
  26. 18.8
  27. True
  28. the one nearest an end
  29. lights up
  30. less than either one
  31. resistance
  32. 0.2
  33. voltmeter
  34. bigger
  35. 0.2
  36. 1.6
  37. the push of a cell
  38. wastes electricity
  39. has coloured bands
  40. 0.2

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