Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 718 · 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.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
2. 2.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
3. 3.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) run fans in empty rooms (d) switch off empty rooms
5. 5.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) set the AC to 24 °C (d) switch off empty rooms
6. 6.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) close the fridge quickly (d) use old filament bulbs
7. 7.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) unplug idle chargers (d) leave the TV on standby
8. 8.True or false: to use old filament bulbs saves electricity. (a) False (b) True
9. 9.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
10. 10.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
11. 11.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
12. 12.🧾 A family uses 120 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
13. 13.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) iron one shirt at a time
15. 15.🧾 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?
16. 16.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) leave fridge door open (d) switch off empty rooms
17. 17.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) close the fridge quickly (d) unplug idle chargers
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
19. 19.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
20. 20.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) a candle (d) an oil lamp
21. 21.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) run fans in empty rooms (d) unplug idle chargers
23. 23.True or false: to switch off empty rooms saves electricity. (a) False (b) True
24. 24.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
25. 25.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
26. 26.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
29. 29.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) use old filament bulbs (d) run fans in empty rooms
30. 30.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
31. 31.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) leave fridge door open (d) switch off empty rooms
32. 32.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
33. 33.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
34. 34.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) iron one shirt at a time (d) use daylight to read
35. 35.🔍 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
36. 36.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) use old filament bulbs (d) run fans in empty rooms
37. 37.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
40. 40.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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