Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 759 · 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 is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) leave the TV on standby (d) use daylight to read
2. 2.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
4. 4.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
5. 5.True or false: to use daylight to read wastes electricity. (a) True (b) False
6. 6.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
7. 7.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) leave fridge door open
8. 8.Which of these saves electricity? (a) unplug idle chargers (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
9. 9.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
10. 10.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
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 close the fridge quickly? (a) wastes electricity (b) saves electricity
13. 13.Which of these saves electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) iron one shirt at a time (d) leave fridge door open
14. 14.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) use old filament bulbs
15. 15.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
16. 16.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
17. 17.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
18. 18.🧾 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?
19. 19.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
21. 21.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
22. 22.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) set the AC to 24 °C (d) use daylight to read
23. 23.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) set the AC to 24 °C (d) leave fridge door open
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
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 leave the TV on standby wastes electricity. (a) True (b) False
29. 29.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) use old filament bulbs (d) run fans in empty rooms
30. 30.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: to use old filament bulbs saves electricity. (a) False (b) True
32. 32.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
33. 33.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) use LED lamps (d) unplug idle chargers
34. 34.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) use LED lamps (d) use daylight to read
35. 35.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
36. 36.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) run fans in empty rooms (d) leave the TV on standby
38. 38.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) iron one shirt at a time
39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
40. 40.True or false: to unplug idle chargers saves electricity. (a) False (b) True

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