Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 744 · 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) use daylight to read (b) use old filament bulbs (c) switch off empty rooms (d) close the fridge quickly
2. 2.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
4. 4.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) set the AC to 24 °C (d) leave the TV on standby
5. 5.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
6. 6.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
7. 7.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) use LED lamps
8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
9. 9.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
10. 10.True or false: to use daylight to read wastes electricity. (a) True (b) False
11. 11.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.True or false: to leave fridge door open wastes electricity. (a) True (b) False
13. 13.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
14. 14.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
15. 15.🧾 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?
16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
17. 17.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
18. 18.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
19. 19.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
20. 20.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
21. 21.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
22. 22.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
23. 23.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use daylight to read (d) run fans in empty rooms
25. 25.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
27. 27.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
29. 29.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
30. 30.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) use daylight to read (d) leave the TV on standby
31. 31.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) unplug idle chargers
32. 32.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
33. 33.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
34. 34.True or false: to switch off empty rooms saves electricity. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) set the AC to 24 °C
36. 36.Which of these wastes electricity? (a) iron one shirt at a time (b) use LED lamps (c) close the fridge quickly (d) use daylight to read
37. 37.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) iron one shirt at a time (d) switch off empty rooms
39. 39.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) use daylight to read (d) use old filament bulbs

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