Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 69 · 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.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
2. 2.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
3. 3.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
4. 4.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
5. 5.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) switch off empty rooms (d) set the AC to 24 °C
7. 7.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) leave fridge door open (d) iron one shirt at a time
8. 8.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
9. 9.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
10. 10.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) iron one shirt at a time (d) use old filament bulbs
12. 12.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 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?
14. 14.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
15. 15.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
16. 16.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
17. 17.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) switch off empty rooms (d) use old filament bulbs
18. 18.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
19. 19.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
20. 20.🧾 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?
21. 21.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 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?
23. 23.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) close the fridge quickly (d) unplug idle chargers
24. 24.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
25. 25.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) unplug idle chargers (d) leave the TV on standby
27. 27.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) unplug idle chargers (d) set the AC to 24 °C
28. 28.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) leave fridge door open (d) iron one shirt at a time
30. 30.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) run fans in empty rooms (d) switch off empty rooms
31. 31.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 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?
33. 33.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) use LED lamps
35. 35.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
36. 36.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
37. 37.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) switch off empty rooms (d) leave the TV on standby
38. 38.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) leave fridge door open
39. 39.Which of these wastes electricity? (a) use old filament bulbs (b) use daylight to read (c) use LED lamps (d) switch off empty rooms
40. 40.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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