Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 87 · 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) leave the TV on standby (b) switch off empty rooms (c) use daylight to read (d) set the AC to 24 °C
2. 2.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
3. 3.True or false: to unplug idle chargers saves electricity. (a) True (b) False
4. 4.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) use daylight to read
5. 5.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) close the fridge quickly
7. 7.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
10. 10.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) set the AC to 24 °C (d) switch off empty rooms
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
12. 12.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
13. 13.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) leave the TV on standby (d) use old filament bulbs
14. 14.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
15. 15.🧾 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?
16. 16.True or false: to use daylight to read saves electricity. (a) True (b) False
17. 17.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
18. 18.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) use daylight to read (d) switch off empty rooms
19. 19.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
20. 20.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) close the fridge quickly
21. 21.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) unplug idle chargers
22. 22.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
23. 23.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
24. 24.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) close the fridge quickly (d) set the AC to 24 °C
25. 25.True or false: to leave fridge door open saves electricity. (a) True (b) False
26. 26.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
27. 27.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
28. 28.True or false: to use LED lamps wastes electricity. (a) False (b) True
29. 29.🧾 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?
30. 30.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) use LED lamps
32. 32.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) switch off empty rooms
33. 33.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
34. 34.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) use old filament bulbs (d) iron one shirt at a time
35. 35.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
36. 36.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
37. 37.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
38. 38.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
39. 39.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
40. 40.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

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