Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 801 · 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.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
2. 2.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) use daylight to read (d) use LED lamps
3. 3.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) leave the TV on standby (d) leave fridge door open
5. 5.True or false: to use LED lamps wastes electricity. (a) True (b) False
6. 6.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) close the fridge quickly (d) switch off empty rooms
7. 7.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
9. 9.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave the TV on standby (d) leave fridge door open
10. 10.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) run fans in empty rooms (d) iron one shirt at a time
11. 11.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
12. 12.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
13. 13.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) use daylight to read
14. 14.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) use daylight to read (d) switch off empty rooms
15. 15.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
16. 16.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
17. 17.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
18. 18.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) set the AC to 24 °C (d) run fans in empty rooms
20. 20.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
21. 21.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use LED lamps (d) set the AC to 24 °C
22. 22.True or false: to close the fridge quickly saves electricity. (a) True (b) False
23. 23.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
24. 24.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) set the AC to 24 °C (d) switch off empty rooms
25. 25.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
27. 27.True or false: to leave the TV on standby saves electricity. (a) True (b) False
28. 28.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) unplug idle chargers
29. 29.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) set the AC to 24 °C (d) use LED lamps
30. 30.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 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?
32. 32.True or false: to use daylight to read wastes electricity. (a) True (b) False
33. 33.True or false: to unplug idle chargers saves electricity. (a) False (b) True
34. 34.True or false: to use LED lamps saves electricity. (a) False (b) True
35. 35.🧾 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?
36. 36.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
37. 37.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to use daylight to read saves electricity. (a) True (b) False
39. 39.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity

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