Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 657 · 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.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) run fans in empty rooms (d) close the fridge quickly
2. 2.🧾 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?
3. 3.🧾 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
4. 4.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
6. 6.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
7. 7.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) leave the TV on standby (d) switch off empty rooms
8. 8.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) leave fridge door open (d) use daylight to read
9. 9.Which of these saves electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
10. 10.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
11. 11.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) use old filament bulbs (d) use daylight to read
12. 12.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
13. 13.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) set the AC to 24 °C (d) iron one shirt at a time
14. 14.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
15. 15.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
16. 16.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
18. 18.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) iron one shirt at a time (d) use LED lamps
19. 19.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
21. 21.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
23. 23.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
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 7 hours. How many watt-hours (Wh) are saved?
25. 25.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) leave fridge door open (d) switch off empty rooms
26. 26.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) use LED lamps
27. 27.🧾 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?
28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
29. 29.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
30. 30.True or false: to use old filament bulbs saves electricity. (a) False (b) True
31. 31.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) set the AC to 24 °C (d) leave the TV on standby
33. 33.True or false: to use daylight to read wastes electricity. (a) True (b) False
34. 34.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
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 10 hours. How many watt-hours (Wh) are saved?
36. 36.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
37. 37.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
38. 38.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) iron one shirt at a time (d) set the AC to 24 °C
39. 39.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) set the AC to 24 °C (d) unplug idle chargers

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