Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 206 · 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 close the fridge quickly? (a) wastes electricity (b) saves electricity
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
3. 3.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
4. 4.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
5. 5.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
6. 6.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
7. 7.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
10. 10.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
11. 11.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) unplug idle chargers (d) run fans in empty rooms
12. 12.True or false: to use daylight to read wastes electricity. (a) True (b) False
13. 13.True or false: to use LED lamps wastes electricity. (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) set the AC to 24 °C (d) unplug idle chargers
15. 15.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
16. 16.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) use LED lamps (d) switch off empty rooms
17. 17.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
18. 18.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
19. 19.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
20. 20.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
21. 21.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
23. 23.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) use old filament bulbs (d) leave the TV on standby
24. 24.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) unplug idle chargers
26. 26.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
27. 27.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
28. 28.Which of these wastes electricity? (a) leave fridge door open (b) use daylight to read (c) unplug idle chargers (d) set the AC to 24 °C
29. 29.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) leave the TV on standby
30. 30.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) set the AC to 24 °C (d) leave the TV on standby
32. 32.True or false: to use LED lamps saves electricity. (a) False (b) True
33. 33.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
34. 34.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) switch off empty rooms (d) iron one shirt at a time
36. 36.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
37. 37.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
38. 38.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use LED lamps (d) iron one shirt at a time
39. 39.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) use LED lamps
40. 40.True or false: to switch off empty rooms wastes electricity. (a) True (b) False

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