Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 925 · 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) close the fridge quickly (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
2. 2.Which of these wastes electricity? (a) use daylight to read (b) leave fridge door open (c) use LED lamps (d) switch off empty rooms
3. 3.🧾 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?
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) use old filament bulbs (d) iron one shirt at a time
5. 5.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
6. 6.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
7. 7.🧾 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
8. 8.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
10. 10.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) unplug idle chargers
11. 11.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
12. 12.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
15. 15.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) use daylight to read (d) close the fridge quickly
17. 17.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
18. 18.True or false: to use LED lamps wastes electricity. (a) False (b) True
19. 19.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) run fans in empty rooms (d) use daylight to read
21. 21.Which of these saves electricity? (a) leave fridge door open (b) close the fridge quickly (c) run fans in empty rooms (d) leave the TV on standby
22. 22.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
23. 23.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use daylight to read
25. 25.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) use LED lamps (d) switch off empty rooms
27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
28. 28.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) use LED lamps (d) leave fridge door open
29. 29.True or false: to leave fridge door open wastes electricity. (a) True (b) False
30. 30.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
31. 31.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
33. 33.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
34. 34.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
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 4 hours. How many watt-hours (Wh) are saved?
36. 36.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
37. 37.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) switch off empty rooms
38. 38.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) use old filament bulbs (d) iron one shirt at a time
39. 39.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

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