Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 435 · 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 6 hours. How many watt-hours (Wh) are saved?
2. 2.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave fridge door open (d) unplug idle chargers
3. 3.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
4. 4.True or false: to use daylight to read wastes electricity. (a) True (b) False
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
6. 6.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
7. 7.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
8. 8.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
9. 9.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
10. 10.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
11. 11.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) run fans in empty rooms (d) use daylight to read
13. 13.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
14. 14.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
15. 15.True or false: to switch off empty rooms saves electricity. (a) True (b) False
16. 16.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
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 4 hours. How many watt-hours (Wh) are saved?
18. 18.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
19. 19.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
20. 20.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) set the AC to 24 °C (d) switch off empty rooms
21. 21.True or false: to use old filament bulbs saves electricity. (a) True (b) False
22. 22.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
23. 23.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) use daylight to read (d) unplug idle chargers
24. 24.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) use LED lamps (d) use old filament bulbs
25. 25.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
27. 27.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
29. 29.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) switch off empty rooms
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 10 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: to use LED lamps saves electricity. (a) True (b) False
32. 32.True or false: to use daylight to read saves electricity. (a) False (b) True
33. 33.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
35. 35.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) close the fridge quickly
37. 37.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
38. 38.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) unplug idle chargers (d) iron one shirt at a time

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