Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 844 · 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.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
2. 2.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
3. 3.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) iron one shirt at a time (d) leave fridge door open
4. 4.Which of these saves electricity? (a) use daylight to read (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
5. 5.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
7. 7.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
8. 8.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
9. 9.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) switch off empty rooms (d) use LED lamps
10. 10.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
13. 13.True or false: to unplug idle chargers saves electricity. (a) True (b) False
14. 14.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
15. 15.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
16. 16.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) unplug idle chargers (d) use LED lamps
17. 17.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
18. 18.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) use daylight to read (d) unplug idle chargers
19. 19.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
20. 20.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
21. 21.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) switch off empty rooms
22. 22.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
23. 23.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
24. 24.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
25. 25.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) switch off empty rooms (d) leave the TV on standby
27. 27.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
28. 28.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
29. 29.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) use daylight to read (d) unplug idle chargers
30. 30.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
31. 31.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
32. 32.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
34. 34.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) unplug idle chargers
35. 35.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) use daylight to read
38. 38.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 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?
40. 40.True or false: to leave fridge door open saves electricity. (a) True (b) False

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