Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 312 · 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 family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
2. 2.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave fridge door open
3. 3.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
5. 5.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
6. 6.True or false: to leave fridge door open wastes electricity. (a) True (b) False
7. 7.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
8. 8.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave fridge door open
9. 9.🧾 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
10. 10.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
11. 11.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) leave fridge door open (d) set the AC to 24 °C
12. 12.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
13. 13.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) switch off empty rooms (d) leave the TV on standby
14. 14.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
15. 15.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
16. 16.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) run fans in empty rooms (d) switch off empty rooms
17. 17.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) unplug idle chargers (d) set the AC to 24 °C
19. 19.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
20. 20.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) switch off empty rooms (d) unplug idle chargers
21. 21.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
22. 22.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
24. 24.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers
25. 25.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
26. 26.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) use LED lamps
27. 27.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
28. 28.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
29. 29.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
30. 30.True or false: to use old filament bulbs saves electricity. (a) False (b) True
31. 31.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
32. 32.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
34. 34.True or false: to leave fridge door open saves electricity. (a) False (b) True
35. 35.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
37. 37.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
38. 38.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
39. 39.True or false: to use LED lamps wastes electricity. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) switch off empty rooms (d) leave fridge door open

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