Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 364 · 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.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
2. 2.🧾 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?
3. 3.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
4. 4.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
5. 5.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use LED lamps (d) use old filament bulbs
7. 7.🧾 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
8. 8.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) use daylight to read
9. 9.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
11. 11.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
12. 12.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
14. 14.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) leave the TV on standby (d) close the fridge quickly
15. 15.True or false: to use LED lamps saves electricity. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) use LED lamps
17. 17.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
19. 19.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) use old filament bulbs
22. 22.🧾 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?
23. 23.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
24. 24.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
25. 25.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
27. 27.Which of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) use LED lamps (d) switch off empty rooms
28. 28.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
29. 29.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 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?
31. 31.True or false: to use old filament bulbs saves electricity. (a) True (b) False
32. 32.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) switch off empty rooms (d) set the AC to 24 °C
33. 33.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) unplug idle chargers (d) iron one shirt at a time
34. 34.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
35. 35.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
37. 37.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use daylight to read (d) leave fridge door open
38. 38.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
39. 39.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) close the fridge quickly (d) use old filament bulbs

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