Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 298 · 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.True or false: to leave fridge door open saves electricity. (a) False (b) True
2. 2.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) run fans in empty rooms (d) switch off empty rooms
3. 3.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
5. 5.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
6. 6.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
7. 7.True or false: to leave the TV on standby saves electricity. (a) True (b) False
8. 8.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) run fans in empty rooms
9. 9.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
10. 10.True or false: to unplug idle chargers saves electricity. (a) False (b) True
11. 11.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
13. 13.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
14. 14.True or false: to switch off empty rooms saves electricity. (a) False (b) True
15. 15.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
17. 17.🧾 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?
18. 18.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
19. 19.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
20. 20.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) close the fridge quickly (d) unplug idle chargers
21. 21.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) use old filament bulbs (d) unplug idle chargers
22. 22.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) switch off empty rooms (d) run fans in empty rooms
23. 23.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) switch off empty rooms (d) iron one shirt at a time
24. 24.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) use daylight to read
25. 25.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
26. 26.🧾 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?
27. 27.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) leave fridge door open (d) set the AC to 24 °C
28. 28.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
32. 32.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
33. 33.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
34. 34.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
35. 35.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
36. 36.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.🧾 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?
39. 39.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use LED lamps (d) unplug idle chargers
40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?

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