Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 305 · 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 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
2. 2.True or false: to use daylight to read saves electricity. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs
4. 4.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) run fans in empty rooms (d) set the AC to 24 °C
5. 5.🧾 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?
6. 6.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
7. 7.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
9. 9.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
10. 10.True or false: to use old filament bulbs saves electricity. (a) False (b) True
11. 11.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
12. 12.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
13. 13.True or false: to switch off empty rooms saves electricity. (a) True (b) False
14. 14.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) use old filament bulbs (d) leave the TV on standby
15. 15.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use LED lamps (d) switch off empty rooms
16. 16.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) iron one shirt at a time (d) use LED lamps
17. 17.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) use old filament bulbs (d) switch off empty rooms
18. 18.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
19. 19.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
20. 20.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
21. 21.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) use daylight to read
23. 23.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
25. 25.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
26. 26.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
27. 27.True or false: to use daylight to read wastes electricity. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) leave the TV on standby (d) set the AC to 24 °C
29. 29.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
30. 30.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
31. 31.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) use daylight to read (d) run fans in empty rooms
32. 32.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
33. 33.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) leave fridge door open (d) use LED lamps
34. 34.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
35. 35.🧾 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?
36. 36.🧾 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
37. 37.True or false: to close the fridge quickly saves electricity. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) set the AC to 24 °C (d) run fans in empty rooms
39. 39.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) use daylight to read
40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?

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