Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 200 · 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) a candle (c) an oil lamp (d) an LED lamp
2. 2.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
3. 3.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
5. 5.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
6. 6.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) use LED lamps (d) switch off empty rooms
7. 7.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
9. 9.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) set the AC to 24 °C (d) use daylight to read
10. 10.True or false: to use daylight to read saves electricity. (a) False (b) True
11. 11.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) switch off empty rooms (d) leave fridge door open
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
13. 13.True or false: to unplug idle chargers saves electricity. (a) False (b) True
14. 14.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
16. 16.True or false: to leave fridge door open wastes electricity. (a) False (b) True
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 3 hours. How many watt-hours (Wh) are saved?
18. 18.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
19. 19.Which of these wastes electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) use LED lamps (d) close the fridge quickly
20. 20.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use daylight to read (d) set the AC to 24 °C
21. 21.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
22. 22.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
23. 23.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) use old filament bulbs
24. 24.True or false: to use daylight to read wastes electricity. (a) True (b) False
25. 25.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
26. 26.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
27. 27.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) iron one shirt at a time
29. 29.🧾 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?
30. 30.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
31. 31.🧾 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?
32. 32.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
33. 33.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use daylight to read (d) run fans in empty rooms
37. 37.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) set the AC to 24 °C (d) use LED lamps
38. 38.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
39. 39.🧾 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?
40. 40.🧾 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?

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