Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 766 · 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) use LED lamps (c) switch off empty rooms (d) run fans in empty rooms
2. 2.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) run fans in empty rooms (d) set the AC to 24 °C
3. 3.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) use old filament bulbs (d) leave the TV on standby
4. 4.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
5. 5.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
6. 6.True or false: to close the fridge quickly saves electricity. (a) False (b) True
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
8. 8.🧾 A 250 W appliance runs for 2 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.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) close the fridge quickly
12. 12.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
14. 14.🧾 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?
15. 15.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) iron one shirt at a time (d) close the fridge quickly
16. 16.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
17. 17.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) close the fridge quickly
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) iron one shirt at a time (d) use old filament bulbs
19. 19.🧾 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?
20. 20.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
21. 21.True or false: to unplug idle chargers saves electricity. (a) True (b) False
22. 22.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) iron one shirt at a time (d) use LED lamps
23. 23.True or false: to use LED lamps wastes electricity. (a) False (b) True
24. 24.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) leave fridge door open (d) close the fridge quickly
25. 25.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
26. 26.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
27. 27.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
28. 28.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
29. 29.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
31. 31.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
32. 32.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
33. 33.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) leave fridge door open (d) set the AC to 24 °C
34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
35. 35.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) set the AC to 24 °C (d) use daylight to read
36. 36.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
37. 37.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
39. 39.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
40. 40.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?

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