Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 965 · 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 lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
2. 2.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
3. 3.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
4. 4.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
6. 6.True or false: to use LED lamps saves electricity. (a) False (b) True
7. 7.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
9. 9.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) use LED lamps
10. 10.🧾 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?
11. 11.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) use LED lamps (d) set the AC to 24 °C
12. 12.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
13. 13.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) iron one shirt at a time (d) use daylight to read
15. 15.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
16. 16.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
17. 17.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) switch off empty rooms (d) leave the TV on standby
18. 18.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
19. 19.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
20. 20.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) leave fridge door open
21. 21.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
23. 23.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
24. 24.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
25. 25.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) close the fridge quickly (d) run fans in empty rooms
27. 27.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) use LED lamps (d) unplug idle chargers
28. 28.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) use LED lamps
29. 29.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
30. 30.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
31. 31.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
32. 32.🧾 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?
33. 33.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) unplug idle chargers (d) leave fridge door open
34. 34.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
35. 35.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) close the fridge quickly
37. 37.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) use old filament bulbs (d) run fans in empty rooms
38. 38.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) leave fridge door open (d) use LED lamps
39. 39.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity

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