Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 690 · 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 run fans in empty rooms? (a) wastes electricity (b) saves electricity
2. 2.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) unplug idle chargers (d) switch off empty rooms
3. 3.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) unplug idle chargers (d) run fans in empty rooms
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) use old filament bulbs
5. 5.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
6. 6.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
7. 7.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
9. 9.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
10. 10.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
11. 11.True or false: to leave fridge door open saves electricity. (a) True (b) False
12. 12.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
14. 14.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave fridge door open (d) run fans in empty rooms
16. 16.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
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 3 hours. How many watt-hours (Wh) are saved?
18. 18.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) use old filament bulbs (d) set the AC to 24 °C
19. 19.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
20. 20.🧾 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?
21. 21.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) use LED lamps (d) run fans in empty rooms
23. 23.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) iron one shirt at a time (d) leave fridge door open
26. 26.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
27. 27.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
28. 28.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) unplug idle chargers (d) iron one shirt at a time
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) leave fridge door open (d) iron one shirt at a time
30. 30.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
31. 31.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
32. 32.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
33. 33.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
34. 34.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use daylight to read (d) iron one shirt at a time
35. 35.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
37. 37.True or false: to use daylight to read wastes electricity. (a) True (b) False
38. 38.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
39. 39.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
40. 40.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) leave fridge door open (d) use daylight to read

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