Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 171 · 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) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
2. 2.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
3. 3.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) run fans in empty rooms (d) unplug idle chargers
4. 4.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
5. 5.🧾 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?
6. 6.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave the TV on standby (d) use daylight to read
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
8. 8.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) iron one shirt at a time (d) switch off empty rooms
9. 9.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) use LED lamps (d) unplug idle chargers
10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) close the fridge quickly
11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
12. 12.True or false: to use LED lamps 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.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) run fans in empty rooms (d) leave fridge door open
16. 16.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
17. 17.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
19. 19.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
21. 21.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
22. 22.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
23. 23.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
26. 26.True or false: to use LED lamps saves electricity. (a) False (b) True
27. 27.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use daylight to read (d) leave fridge door open
28. 28.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
30. 30.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) iron one shirt at a time (d) run fans in empty rooms
32. 32.True or false: to leave fridge door open wastes electricity. (a) True (b) False
33. 33.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
34. 34.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
35. 35.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
36. 36.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) close the fridge quickly (d) use daylight to read
38. 38.🧾 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?
39. 39.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) leave the TV on standby (d) switch off empty rooms
40. 40.True or false: to close the fridge quickly wastes electricity. (a) False (b) True

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