Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 163 · 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.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
2. 2.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
3. 3.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) use old filament bulbs (d) unplug idle chargers
4. 4.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) use old filament bulbs (d) iron one shirt at a time
5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) leave the TV on standby (d) iron one shirt at a time
6. 6.True or false: to unplug idle chargers saves electricity. (a) False (b) True
7. 7.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
9. 9.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) close the fridge quickly
10. 10.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) switch off empty rooms (d) unplug idle chargers
11. 11.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) switch off empty rooms (d) use daylight to read
12. 12.🧾 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?
13. 13.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
14. 14.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
15. 15.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
16. 16.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use daylight to read (d) unplug idle chargers
17. 17.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
18. 18.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
19. 19.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
20. 20.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
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 10 hours. How many watt-hours (Wh) are saved?
23. 23.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
24. 24.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave fridge door open (d) close the fridge quickly
25. 25.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
27. 27.🔍 Which is the odd one out? (a) use old filament bulbs (b) switch off empty rooms (c) leave the TV on standby (d) iron one shirt at a time
28. 28.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
29. 29.True or false: to use LED lamps saves electricity. (a) True (b) False
30. 30.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
31. 31.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) leave fridge door open (d) switch off empty rooms
32. 32.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to leave fridge door open wastes electricity. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) run fans in empty rooms (d) unplug idle chargers
35. 35.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
37. 37.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
38. 38.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) leave the TV on standby (d) iron one shirt at a time
39. 39.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) use daylight to read
40. 40.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?

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