Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 419 · 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.True or false: to leave the TV on standby saves electricity. (a) True (b) False
2. 2.🧾 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?
3. 3.True or false: to leave fridge door open wastes electricity. (a) False (b) True
4. 4.🧾 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
5. 5.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) use old filament bulbs (d) leave the TV on standby
6. 6.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
8. 8.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
9. 9.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
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) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) leave the TV on standby
12. 12.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) leave the TV on standby (d) close the fridge quickly
13. 13.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
14. 14.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
15. 15.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
16. 16.True or false: to use LED lamps wastes electricity. (a) True (b) False
17. 17.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
19. 19.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
21. 21.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
22. 22.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) close the fridge quickly
23. 23.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) switch off empty rooms
24. 24.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
25. 25.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) close the fridge quickly (d) leave fridge door open
26. 26.True or false: to use old filament bulbs saves electricity. (a) True (b) False
27. 27.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) iron one shirt at a time (d) unplug idle chargers
28. 28.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
30. 30.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) run fans in empty rooms (d) leave fridge door open
32. 32.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
33. 33.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) leave the TV on standby (d) leave fridge door open
39. 39.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
40. 40.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open

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