Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 68 · 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 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
2. 2.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) close the fridge quickly (d) unplug idle chargers
3. 3.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) run fans in empty rooms (d) use old filament bulbs
4. 4.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
5. 5.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
6. 6.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
7. 7.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) use daylight to read (d) switch off empty rooms
8. 8.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
10. 10.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) close the fridge quickly
11. 11.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
13. 13.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
14. 14.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
15. 15.🧾 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?
16. 16.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) use old filament bulbs
17. 17.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
19. 19.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) iron one shirt at a time
20. 20.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) switch off empty rooms (d) unplug idle chargers
21. 21.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
22. 22.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) leave the TV on standby (d) close the fridge quickly
23. 23.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) switch off empty rooms (d) use old filament bulbs
24. 24.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
25. 25.🧾 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?
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
27. 27.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
28. 28.True or false: to use daylight to read wastes electricity. (a) True (b) False
29. 29.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) set the AC to 24 °C (d) use LED lamps
31. 31.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) unplug idle chargers (d) switch off empty rooms
32. 32.True or false: to leave fridge door open saves electricity. (a) True (b) False
33. 33.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
34. 34.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
35. 35.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) leave fridge door open
36. 36.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
37. 37.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
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 6 hours. How many watt-hours (Wh) are saved?
39. 39.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?

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