Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 828 · 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) close the fridge quickly (b) leave fridge door open (c) unplug idle chargers (d) use LED lamps
2. 2.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) close the fridge quickly
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
4. 4.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) set the AC to 24 °C
5. 5.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) switch off empty rooms (d) iron one shirt at a time
6. 6.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
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.🧾 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?
9. 9.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
11. 11.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
12. 12.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
13. 13.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
15. 15.True or false: to leave the TV on standby saves electricity. (a) False (b) True
16. 16.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
17. 17.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) unplug idle chargers (d) leave the TV on standby
18. 18.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
19. 19.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) close the fridge quickly
20. 20.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) use old filament bulbs (d) close the fridge quickly
21. 21.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
22. 22.🧾 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?
23. 23.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
24. 24.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
26. 26.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.🧾 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?
28. 28.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) use daylight to read (d) switch off empty rooms
29. 29.True or false: to leave fridge door open wastes electricity. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
31. 31.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) run fans in empty rooms
33. 33.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) iron one shirt at a time (d) leave fridge door open
35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
36. 36.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
37. 37.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
38. 38.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
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 use daylight to read? (a) saves electricity (b) wastes electricity

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