Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 767 · 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.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
2. 2.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
3. 3.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
4. 4.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
5. 5.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) set the AC to 24 °C
6. 6.🧾 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
7. 7.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) switch off empty rooms (d) use LED lamps
8. 8.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
9. 9.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) close the fridge quickly (d) use daylight to read
10. 10.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) use LED lamps (d) use old filament bulbs
11. 11.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
15. 15.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
17. 17.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
18. 18.True or false: to use LED lamps saves electricity. (a) True (b) False
19. 19.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
20. 20.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
21. 21.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) use old filament bulbs
22. 22.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
23. 23.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
24. 24.🧾 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?
25. 25.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
29. 29.🧾 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?
30. 30.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
31. 31.🧾 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?
32. 32.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
33. 33.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
34. 34.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (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 5 hours. How many watt-hours (Wh) are saved?
36. 36.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
37. 37.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) use old filament bulbs
38. 38.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
39. 39.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
40. 40.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

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