Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 916 · 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.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
2. 2.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use daylight to read (d) use LED lamps
3. 3.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) unplug idle chargers (d) close the fridge quickly
4. 4.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
5. 5.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) switch off empty rooms (d) iron one shirt at a time
6. 6.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) leave fridge door open (d) leave the TV on standby
7. 7.🧾 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?
8. 8.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 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?
10. 10.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
12. 12.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
13. 13.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
14. 14.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) run fans in empty rooms
16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
17. 17.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) unplug idle chargers
18. 18.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
19. 19.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
21. 21.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
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 10 hours. How many watt-hours (Wh) are saved?
23. 23.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) iron one shirt at a time (d) switch off empty rooms
24. 24.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
25. 25.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
27. 27.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use daylight to read (d) use old filament bulbs
28. 28.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) run fans in empty rooms (d) use old filament bulbs
29. 29.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
31. 31.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) leave fridge door open (d) set the AC to 24 °C
34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) leave fridge door open (d) set the AC to 24 °C
35. 35.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
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 6 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 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?
38. 38.True or false: to switch off empty rooms saves electricity. (a) True (b) False
39. 39.True or false: to use LED lamps wastes electricity. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use LED lamps (d) unplug idle chargers

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