Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 926 · 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) use LED lamps (b) set the AC to 24 °C (c) unplug idle chargers (d) leave the TV on standby
2. 2.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
3. 3.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
4. 4.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
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 7 hours. How many watt-hours (Wh) are saved?
8. 8.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) run fans in empty rooms (d) use old filament bulbs
9. 9.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
11. 11.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
13. 13.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
14. 14.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
15. 15.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) leave fridge door open (d) close the fridge quickly
16. 16.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) run fans in empty rooms (d) switch off empty rooms
17. 17.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
18. 18.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
21. 21.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) unplug idle chargers (d) run fans in empty rooms
22. 22.True or false: to switch off empty rooms saves electricity. (a) True (b) False
23. 23.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
24. 24.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
25. 25.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
26. 26.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
28. 28.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
29. 29.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
30. 30.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.Which of these wastes electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) set the AC to 24 °C (d) unplug idle chargers
32. 32.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) set the AC to 24 °C (d) unplug idle chargers
33. 33.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) use old filament bulbs (d) close the fridge quickly
34. 34.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
35. 35.Which of these wastes electricity? (a) leave fridge door open (b) use LED lamps (c) use daylight to read (d) unplug idle chargers
36. 36.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
37. 37.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
39. 39.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) use daylight to read
40. 40.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs

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