Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 238 · 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 wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) use LED lamps
2. 2.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
3. 3.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
4. 4.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
5. 5.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
6. 6.🧾 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?
7. 7.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
8. 8.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 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
10. 10.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs
11. 11.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) close the fridge quickly (d) use daylight to read
12. 12.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
14. 14.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
15. 15.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) close the fridge quickly (d) run fans in empty rooms
16. 16.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
17. 17.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use LED lamps (d) leave the TV on standby
18. 18.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) close the fridge quickly
20. 20.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
21. 21.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
22. 22.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
23. 23.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
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 4 hours. How many watt-hours (Wh) are saved?
26. 26.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
27. 27.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
28. 28.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) use LED lamps
30. 30.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) unplug idle chargers (d) use old filament bulbs
31. 31.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
32. 32.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) use daylight to read (d) leave the TV on standby
33. 33.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) use old filament bulbs (d) use daylight to read
34. 34.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
35. 35.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
36. 36.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) use daylight to read
37. 37.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
39. 39.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?

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