Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 443 · 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) set the AC to 24 °C (c) leave the TV on standby (d) unplug idle chargers
2. 2.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) unplug idle chargers (d) use daylight to read
3. 3.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
4. 4.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
6. 6.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
7. 7.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
9. 9.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to use daylight to read saves electricity. (a) False (b) True
11. 11.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
12. 12.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) leave fridge door open (d) leave the TV on standby
13. 13.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) leave fridge door open (d) use old filament bulbs
14. 14.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
16. 16.True or false: to switch off empty rooms saves electricity. (a) False (b) True
17. 17.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
18. 18.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) unplug idle chargers (d) set the AC to 24 °C
19. 19.Which of these wastes electricity? (a) run fans in empty rooms (b) use daylight to read (c) close the fridge quickly (d) switch off empty rooms
20. 20.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
21. 21.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) close the fridge quickly (d) use daylight to read
22. 22.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
23. 23.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) unplug idle chargers (d) iron one shirt at a time
24. 24.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) set the AC to 24 °C (d) switch off empty rooms
25. 25.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
26. 26.🧾 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?
27. 27.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to use old filament bulbs saves electricity. (a) False (b) True
29. 29.🧾 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?
30. 30.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
31. 31.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
32. 32.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
33. 33.True or false: to leave fridge door open wastes electricity. (a) True (b) False
34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
35. 35.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) close the fridge quickly (d) set the AC to 24 °C
36. 36.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) run fans in empty rooms (d) leave fridge door open
38. 38.🧾 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?
39. 39.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) run fans in empty rooms (d) switch off empty rooms
40. 40.🧾 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?

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