Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 874 · 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 of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
2. 2.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
3. 3.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) switch off empty rooms (d) run fans in empty rooms
4. 4.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
5. 5.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use LED lamps (d) use old filament bulbs
6. 6.True or false: to use LED lamps saves electricity. (a) False (b) True
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
8. 8.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) set the AC to 24 °C (d) use LED lamps
10. 10.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
11. 11.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
13. 13.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) close the fridge quickly (d) leave fridge door open
14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
15. 15.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
16. 16.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) use LED lamps (d) switch off empty rooms
18. 18.True or false: to use daylight to read saves electricity. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) use old filament bulbs (d) leave fridge door open
20. 20.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) close the fridge quickly (d) switch off empty rooms
21. 21.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
23. 23.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
24. 24.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
25. 25.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
26. 26.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
27. 27.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
28. 28.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
29. 29.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
30. 30.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) use LED lamps
32. 32.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
33. 33.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) iron one shirt at a time (d) leave the TV on standby
34. 34.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
35. 35.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) use LED lamps (d) leave the TV on standby
37. 37.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) iron one shirt at a time (d) unplug idle chargers
38. 38.🧾 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?
39. 39.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use daylight to read (d) run fans in empty rooms
40. 40.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity

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