Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 488 · 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 of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) run fans in empty rooms (d) use old filament bulbs
2. 2.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
3. 3.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
4. 4.True or false: to use daylight to read saves electricity. (a) False (b) True
5. 5.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) unplug idle chargers
6. 6.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) switch off empty rooms (d) set the AC to 24 °C
7. 7.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
8. 8.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
9. 9.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) use LED lamps (d) use daylight to read
10. 10.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) iron one shirt at a time (d) use LED lamps
11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
12. 12.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 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?
14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
15. 15.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) leave fridge door open (d) run fans in empty rooms
16. 16.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) unplug idle chargers (d) use old filament bulbs
17. 17.True or false: to use LED lamps wastes electricity. (a) True (b) False
18. 18.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
19. 19.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
20. 20.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) set the AC to 24 °C
22. 22.True or false: to switch off empty rooms saves electricity. (a) False (b) True
23. 23.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) switch off empty rooms
27. 27.🧾 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?
28. 28.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
29. 29.True or false: to close the fridge quickly saves electricity. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) iron one shirt at a time (d) close the fridge quickly
31. 31.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) use old filament bulbs (d) leave the TV on standby
32. 32.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
33. 33.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) use daylight to read (d) close the fridge quickly
34. 34.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
35. 35.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
37. 37.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
38. 38.🧾 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?
39. 39.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) use old filament bulbs
40. 40.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) close the fridge quickly

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