Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 992 · 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 use LED lamps? (a) saves electricity (b) wastes electricity
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
3. 3.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) set the AC to 24 °C (d) unplug idle chargers
4. 4.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
5. 5.🧾 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?
6. 6.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) use daylight to read (d) run fans in empty rooms
7. 7.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
9. 9.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
10. 10.True or false: to leave the TV on standby saves electricity. (a) False (b) True
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.True or false: to use daylight to read wastes electricity. (a) True (b) False
13. 13.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
15. 15.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
16. 16.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
17. 17.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
18. 18.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
19. 19.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) switch off empty rooms
20. 20.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
21. 21.🧾 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?
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) use LED lamps
23. 23.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 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?
25. 25.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
26. 26.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
28. 28.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
29. 29.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
30. 30.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) close the fridge quickly (d) use LED lamps
31. 31.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
32. 32.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) use daylight to read (d) leave fridge door open
34. 34.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
35. 35.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
36. 36.True or false: to use LED lamps wastes electricity. (a) True (b) False
37. 37.🧾 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?
38. 38.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) run fans in empty rooms (d) unplug idle chargers
40. 40.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity

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