Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 848 · 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.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
2. 2.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) leave the TV on standby (d) unplug idle chargers
3. 3.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
4. 4.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) unplug idle chargers (d) switch off empty rooms
5. 5.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
6. 6.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
7. 7.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
9. 9.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) close the fridge quickly (d) leave fridge door open
10. 10.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
11. 11.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) run fans in empty rooms (d) switch off empty rooms
12. 12.🧾 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?
13. 13.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
15. 15.🧾 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?
16. 16.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
17. 17.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
18. 18.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
19. 19.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
20. 20.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) use LED lamps
21. 21.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
22. 22.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
23. 23.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
24. 24.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
26. 26.True or false: to use daylight to read wastes electricity. (a) True (b) False
27. 27.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) use LED lamps
29. 29.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) use daylight to read (d) switch off empty rooms
30. 30.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
31. 31.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) set the AC to 24 °C
32. 32.True or false: to leave the TV on standby saves electricity. (a) True (b) False
33. 33.True or false: to use LED lamps saves electricity. (a) True (b) False
34. 34.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
35. 35.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
38. 38.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
39. 39.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
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 4 hours. How many watt-hours (Wh) are saved?

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