Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 716 · 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 old filament bulbs? (a) saves electricity (b) wastes electricity
2. 2.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
3. 3.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use daylight to read (d) set the AC to 24 °C
4. 4.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
5. 5.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
6. 6.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
7. 7.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
9. 9.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
10. 10.True or false: to use LED lamps saves electricity. (a) False (b) True
11. 11.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
12. 12.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
14. 14.True or false: to leave fridge door open wastes electricity. (a) True (b) False
15. 15.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
16. 16.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) unplug idle chargers
17. 17.True or false: to use daylight to read wastes electricity. (a) True (b) False
18. 18.🧾 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?
19. 19.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) close the fridge quickly (d) set the AC to 24 °C
20. 20.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) use LED lamps
21. 21.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) unplug idle chargers (d) use LED lamps
24. 24.🧾 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?
25. 25.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) unplug idle chargers (d) switch off empty rooms
26. 26.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
27. 27.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) use LED lamps
29. 29.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
31. 31.True or false: to leave fridge door open saves electricity. (a) True (b) False
32. 32.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) switch off empty rooms (d) use daylight to read
33. 33.True or false: to use LED lamps wastes electricity. (a) False (b) True
34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
35. 35.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
36. 36.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) unplug idle chargers (d) run fans in empty rooms
37. 37.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) switch off empty rooms (d) use old filament bulbs
38. 38.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) leave the TV on standby (d) use old filament bulbs

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