Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 855 · 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 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
2. 2.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
3. 3.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) run fans in empty rooms (d) unplug idle chargers
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) close the fridge quickly
5. 5.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
6. 6.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) use old filament bulbs (d) leave fridge door open
7. 7.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use LED lamps (d) leave fridge door open
9. 9.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
10. 10.True or false: to use LED lamps wastes electricity. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
12. 12.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
13. 13.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) iron one shirt at a time (d) leave fridge door open
15. 15.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use old filament bulbs (d) use LED lamps
16. 16.True or false: to use LED lamps saves electricity. (a) True (b) False
17. 17.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
18. 18.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
19. 19.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
20. 20.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) leave fridge door open (d) use daylight to read
21. 21.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms
24. 24.True or false: to use old filament bulbs saves electricity. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) run fans in empty rooms (d) iron one shirt at a time
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 3 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
28. 28.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
29. 29.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) unplug idle chargers (d) switch off empty rooms
30. 30.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
32. 32.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
33. 33.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) use LED lamps (d) iron one shirt at a time
35. 35.🧾 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?
36. 36.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
38. 38.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) run fans in empty rooms
39. 39.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity

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