Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 401 · 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 of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers
2. 2.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) switch off empty rooms (d) unplug idle chargers
3. 3.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) close the fridge quickly
5. 5.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) set the AC to 24 °C (d) close the fridge quickly
6. 6.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
7. 7.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
9. 9.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) close the fridge quickly (d) unplug idle chargers
10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
11. 11.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
12. 12.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
14. 14.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) iron one shirt at a time (d) use LED lamps
15. 15.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
16. 16.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
18. 18.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) run fans in empty rooms
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
21. 21.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave the TV on standby (d) close the fridge quickly
22. 22.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
23. 23.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
24. 24.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) run fans in empty rooms (d) leave fridge door open
25. 25.True or false: to switch off empty rooms saves electricity. (a) False (b) True
26. 26.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
28. 28.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
30. 30.True or false: to close the fridge quickly saves electricity. (a) False (b) True
31. 31.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
32. 32.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) switch off empty rooms (d) use old filament bulbs
34. 34.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) run fans in empty rooms (d) leave the TV on standby
35. 35.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) leave fridge door open (d) run fans in empty rooms
37. 37.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
38. 38.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) use LED lamps
39. 39.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) use old filament bulbs (d) use LED lamps
40. 40.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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