Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 204 · 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 use LED lamps? (a) wastes electricity (b) saves electricity
2. 2.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
3. 3.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
4. 4.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
5. 5.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) run fans in empty rooms
6. 6.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
7. 7.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) unplug idle chargers (d) close the fridge quickly
8. 8.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
9. 9.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) leave fridge door open (d) use LED lamps
10. 10.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
11. 11.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
13. 13.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use daylight to read (d) leave fridge door open
14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
15. 15.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
16. 16.🧾 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?
17. 17.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave the TV on standby
18. 18.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
19. 19.True or false: to use daylight to read saves electricity. (a) True (b) False
20. 20.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) use old filament bulbs (d) close the fridge quickly
21. 21.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.True or false: to use daylight to read wastes electricity. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) unplug idle chargers
24. 24.🧾 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?
25. 25.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) use LED lamps
26. 26.True or false: to leave fridge door open saves electricity. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) use LED lamps
28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
29. 29.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
30. 30.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) run fans in empty rooms (d) leave the TV on standby
31. 31.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
35. 35.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
36. 36.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to switch off empty rooms saves electricity. (a) False (b) True
38. 38.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
39. 39.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) use LED lamps (d) close the fridge quickly
40. 40.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) close the fridge quickly (d) switch off empty rooms

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