Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 5 · 40 questions

Remember (Watts × hours ÷ 1000): Units (kWh) = watts × hours ÷ 1000. Bill = units × price per unit (e.g. 150 units × ₹6 = ₹900). Save: switch off, LED lamps, daylight, no standby, close the fridge quickly.

1. 1.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) use daylight to read
2. 2.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
3. 3.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
4. 4.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
5. 5.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) a candle (d) an oil lamp
6. 6.True or false: to use old filament bulbs saves electricity. (a) True (b) False
7. 7.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
9. 9.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
10. 10.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) use old filament bulbs (d) leave fridge door open
11. 11.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
12. 12.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
13. 13.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) use daylight to read
14. 14.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
15. 15.Which of these wastes electricity? (a) close the fridge quickly (b) use old filament bulbs (c) use daylight to read (d) unplug idle chargers
16. 16.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) run fans in empty rooms (d) leave fridge door open
17. 17.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
18. 18.True or false: to close the fridge quickly saves electricity. (a) True (b) False
19. 19.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
20. 20.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
21. 21.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) unplug idle chargers (d) leave the TV on standby
22. 22.Which of these wastes electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) close the fridge quickly (d) unplug idle chargers
23. 23.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
24. 24.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
25. 25.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
26. 26.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
28. 28.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) switch off empty rooms (d) set the AC to 24 °C
29. 29.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) close the fridge quickly (d) iron one shirt at a time
31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
32. 32.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) unplug idle chargers (d) close the fridge quickly
34. 34.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) use LED lamps
36. 36.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
37. 37.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
38. 38.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
39. 39.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
40. 40.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids