Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 883 · 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 run fans in empty rooms? (a) wastes electricity (b) saves electricity
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
3. 3.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) leave the TV on standby
4. 4.🧾 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?
5. 5.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
6. 6.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) run fans in empty rooms (d) leave the TV on standby
7. 7.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) leave fridge door open
8. 8.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
9. 9.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
10. 10.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) iron one shirt at a time
11. 11.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
14. 14.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) use LED lamps (d) run fans in empty rooms
15. 15.True or false: to use LED lamps wastes electricity. (a) True (b) False
16. 16.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) leave fridge door open (d) use old filament bulbs
17. 17.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
18. 18.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) leave fridge door open (d) leave the TV on standby
19. 19.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
20. 20.🔍 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
21. 21.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
23. 23.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use daylight to read (d) leave fridge door open
24. 24.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
25. 25.🧾 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?
26. 26.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
27. 27.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
28. 28.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) leave the TV on standby (d) switch off empty rooms
29. 29.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) unplug idle chargers (d) leave the TV on standby
30. 30.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
31. 31.Which of these wastes electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) close the fridge quickly (d) unplug idle chargers
32. 32.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) use old filament bulbs (d) set the AC to 24 °C
33. 33.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) use daylight to read (d) leave fridge door open
35. 35.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
37. 37.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
38. 38.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
39. 39.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
40. 40.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) use old filament bulbs (d) use daylight to read

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