Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 756 · 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.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
2. 2.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
3. 3.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) use LED lamps
4. 4.🧾 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?
5. 5.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) leave fridge door open (d) use old filament bulbs
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) leave fridge door open (d) iron one shirt at a time
7. 7.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
8. 8.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) unplug idle chargers (d) run fans in empty rooms
9. 9.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) unplug idle chargers (d) use daylight to read
10. 10.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
11. 11.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) use LED lamps (d) set the AC to 24 °C
12. 12.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
13. 13.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) leave fridge door open
14. 14.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) use LED lamps (d) unplug idle chargers
15. 15.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
17. 17.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
18. 18.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
19. 19.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
21. 21.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
22. 22.🧾 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?
23. 23.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
24. 24.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
25. 25.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) leave the TV on standby
27. 27.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
28. 28.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
29. 29.True or false: to use old filament bulbs saves electricity. (a) False (b) True
30. 30.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
32. 32.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
33. 33.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave the TV on standby (d) switch off empty rooms
34. 34.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) iron one shirt at a time (d) switch off empty rooms
35. 35.Which of these wastes electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) switch off empty rooms (d) use LED lamps
36. 36.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
37. 37.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
38. 38.True or false: to leave fridge door open wastes electricity. (a) False (b) True
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 1 hour. How many watt-hours (Wh) are saved?
40. 40.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity

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