Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 752 · 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 candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
2. 2.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
4. 4.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) set the AC to 24 °C (d) run fans in empty rooms
5. 5.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) use old filament bulbs
6. 6.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
7. 7.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) run fans in empty rooms (d) leave fridge door open
8. 8.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
9. 9.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
10. 10.True or false: to use LED lamps wastes electricity. (a) False (b) True
11. 11.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) use daylight to read (d) iron one shirt at a time
14. 14.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
15. 15.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) use daylight to read
17. 17.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) switch off empty rooms (d) leave fridge door open
18. 18.True or false: to leave fridge door open saves electricity. (a) False (b) True
19. 19.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
20. 20.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
21. 21.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
23. 23.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
24. 24.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
26. 26.🧾 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?
27. 27.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
28. 28.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) iron one shirt at a time (d) leave the TV on standby
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) switch off empty rooms (d) iron one shirt at a time
30. 30.True or false: to unplug idle chargers saves electricity. (a) True (b) False
31. 31.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
33. 33.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
34. 34.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
35. 35.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) use daylight to read (d) use old filament bulbs
36. 36.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) unplug idle chargers
37. 37.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) switch off empty rooms (d) leave the TV on standby
38. 38.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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