Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 649 · 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 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
2. 2.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
3. 3.True or false: to use LED lamps saves electricity. (a) False (b) True
4. 4.True or false: to use daylight to read wastes electricity. (a) False (b) True
5. 5.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
6. 6.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
7. 7.🧾 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?
8. 8.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
9. 9.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
11. 11.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) iron one shirt at a time
12. 12.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
15. 15.Which of these saves electricity? (a) use LED lamps (b) leave fridge door open (c) iron one shirt at a time (d) use old filament bulbs
16. 16.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
17. 17.🧾 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
18. 18.🧾 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?
19. 19.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
20. 20.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
21. 21.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) switch off empty rooms (d) leave the TV on standby
22. 22.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) switch off empty rooms (d) run fans in empty rooms
23. 23.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) leave fridge door open (d) unplug idle chargers
26. 26.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) leave fridge door open
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
29. 29.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) use old filament bulbs (d) use daylight to read
30. 30.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
31. 31.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) leave fridge door open (d) use daylight to read
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 6 hours. How many watt-hours (Wh) are saved?
33. 33.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) close the fridge quickly (d) use old filament bulbs
34. 34.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
35. 35.Which of these saves electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) use old filament bulbs (d) leave the TV on standby
36. 36.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) use old filament bulbs (d) leave the TV on standby
38. 38.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
39. 39.True or false: to leave the TV on standby saves electricity. (a) True (b) False
40. 40.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) use daylight to read

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