Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 160 · 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) use daylight to read (c) switch off empty rooms (d) use old filament bulbs
2. 2.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
3. 3.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) use daylight to read (d) run fans in empty rooms
4. 4.True or false: to use LED lamps wastes electricity. (a) False (b) True
5. 5.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
6. 6.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) use LED lamps (d) close the fridge quickly
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
8. 8.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
9. 9.🧾 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?
10. 10.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) leave the TV on standby (d) unplug idle chargers
11. 11.🧾 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?
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
13. 13.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
14. 14.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
15. 15.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
16. 16.Which of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) switch off empty rooms (d) use daylight to read
17. 17.Which of these wastes electricity? (a) use LED lamps (b) run fans in empty rooms (c) set the AC to 24 °C (d) use daylight to read
18. 18.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use LED lamps (d) run fans in empty rooms
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 3 hours. How many watt-hours (Wh) are saved?
21. 21.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use daylight to read (d) use LED lamps
22. 22.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) unplug idle chargers (d) leave fridge door open
23. 23.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
24. 24.🧾 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?
25. 25.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
26. 26.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
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 9 hours. How many watt-hours (Wh) are saved?
28. 28.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) use daylight to read (d) run fans in empty rooms
29. 29.True or false: to use daylight to read wastes electricity. (a) True (b) False
30. 30.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
32. 32.🧾 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
33. 33.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
34. 34.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
35. 35.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
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 5 hours. How many watt-hours (Wh) are saved?
37. 37.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) leave the TV on standby (d) run fans in empty rooms
38. 38.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
39. 39.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) unplug idle chargers (d) iron one shirt at a time
40. 40.True or false: to unplug idle chargers wastes electricity. (a) True (b) False

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