Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 105 · 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.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
2. 2.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
3. 3.🧾 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
4. 4.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
5. 5.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
6. 6.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
7. 7.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
8. 8.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) unplug idle chargers
9. 9.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) leave the TV on standby (d) run fans in empty rooms
10. 10.True or false: to close the fridge quickly saves electricity. (a) False (b) True
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
12. 12.True or false: to unplug idle chargers saves electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
15. 15.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) use LED lamps
17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
18. 18.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
19. 19.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
21. 21.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) leave the TV on standby
23. 23.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave the TV on standby (d) set the AC to 24 °C
24. 24.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
26. 26.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) iron one shirt at a time (d) close the fridge quickly
27. 27.🧾 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?
28. 28.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
30. 30.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) use LED lamps (d) leave fridge door open
31. 31.True or false: to use LED lamps saves electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
33. 33.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) iron one shirt at a time (d) switch off empty rooms
34. 34.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
35. 35.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
36. 36.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) close the fridge quickly (d) run fans in empty rooms
37. 37.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
39. 39.True or false: to leave the TV on standby saves electricity. (a) False (b) True
40. 40.True or false: to use daylight to read wastes electricity. (a) False (b) True

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