Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 168 · 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 of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) leave fridge door open
2. 2.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) use daylight to read (d) leave the TV on standby
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
4. 4.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) set the AC to 24 °C
5. 5.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
7. 7.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
8. 8.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
9. 9.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
10. 10.Which of these saves electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) leave fridge door open (d) run fans in empty rooms
11. 11.True or false: to use LED lamps wastes electricity. (a) False (b) True
12. 12.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) use LED lamps (d) leave the TV on standby
13. 13.🧾 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?
14. 14.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
15. 15.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
16. 16.🧾 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?
17. 17.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
18. 18.True or false: to use LED lamps saves electricity. (a) False (b) True
19. 19.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) leave fridge door open (d) close the fridge quickly
20. 20.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) run fans in empty rooms (d) leave fridge door open
21. 21.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) set the AC to 24 °C
23. 23.True or false: to leave fridge door open wastes electricity. (a) False (b) True
24. 24.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
25. 25.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) use daylight to read (d) unplug idle chargers
26. 26.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) iron one shirt at a time (d) set the AC to 24 °C
27. 27.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) unplug idle chargers (d) use daylight to read
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 6 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) unplug idle chargers (d) leave fridge door open
32. 32.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
33. 33.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) leave fridge door open (d) switch off empty rooms
35. 35.🧾 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?
36. 36.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
37. 37.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
38. 38.True or false: to use daylight to read wastes electricity. (a) True (b) False
39. 39.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
40. 40.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity

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