Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 975 · 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 leave the TV on standby? (a) wastes electricity (b) saves electricity
2. 2.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
3. 3.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) switch off empty rooms (d) use LED lamps
4. 4.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
5. 5.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
6. 6.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
7. 7.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
9. 9.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
11. 11.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
12. 12.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
13. 13.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) iron one shirt at a time (d) use LED lamps
14. 14.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
15. 15.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
16. 16.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) use old filament bulbs (d) run fans in empty rooms
17. 17.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
18. 18.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) iron one shirt at a time
19. 19.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) leave the TV on standby (d) use daylight to read
23. 23.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
24. 24.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
26. 26.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
27. 27.True or false: to switch off empty rooms saves electricity. (a) False (b) True
28. 28.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
29. 29.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) switch off empty rooms (d) run fans in empty rooms
30. 30.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
31. 31.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
32. 32.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave fridge door open (d) iron one shirt at a time
33. 33.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
34. 34.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
36. 36.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) set the AC to 24 °C
37. 37.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) close the fridge quickly (d) use LED lamps
38. 38.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
39. 39.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps

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