Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 247 · 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 use old filament bulbs? (a) saves electricity (b) wastes electricity
2. 2.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
3. 3.🔍 Which is the odd one out? (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
4. 4.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) run fans in empty rooms
5. 5.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) iron one shirt at a time (d) use old filament bulbs
6. 6.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
7. 7.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.True or false: to unplug idle chargers saves electricity. (a) False (b) True
9. 9.True or false: to switch off empty rooms saves electricity. (a) False (b) True
10. 10.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
11. 11.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
12. 12.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. 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) close the fridge quickly (b) leave the TV on standby (c) switch off empty rooms (d) set the AC to 24 °C
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
16. 16.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
17. 17.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
18. 18.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
19. 19.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
20. 20.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
21. 21.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) use old filament bulbs (d) switch off empty rooms
22. 22.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
23. 23.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) switch off empty rooms
24. 24.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
25. 25.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
26. 26.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
28. 28.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) set the AC to 24 °C (d) use daylight to read
29. 29.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
30. 30.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) set the AC to 24 °C
31. 31.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
32. 32.Which of these saves electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
33. 33.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
34. 34.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use daylight to read (d) run fans in empty rooms
35. 35.🧾 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?
36. 36.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) switch off empty rooms (d) leave fridge door open
37. 37.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) use old filament bulbs
38. 38.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) iron one shirt at a time (d) use daylight to read
39. 39.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to use old filament bulbs wastes electricity. (a) True (b) False

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