Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 26 · 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 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
3. 3.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
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 9 hours. How many watt-hours (Wh) are saved?
6. 6.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
7. 7.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
8. 8.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
9. 9.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) use daylight to read (d) use LED lamps
10. 10.🧾 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?
11. 11.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) use LED lamps (d) set the AC to 24 °C
12. 12.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
13. 13.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use daylight to read (d) use old filament bulbs
15. 15.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
16. 16.True or false: to leave fridge door open saves electricity. (a) False (b) True
17. 17.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) switch off empty rooms (d) use old filament bulbs
18. 18.🧾 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?
19. 19.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
20. 20.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) run fans in empty rooms (d) use LED lamps
21. 21.🧾 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?
22. 22.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) set the AC to 24 °C (d) leave the TV on standby
23. 23.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to use daylight to read wastes electricity. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) set the AC to 24 °C (d) leave the TV on standby
27. 27.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
28. 28.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
29. 29.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
30. 30.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
31. 31.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
32. 32.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
33. 33.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
35. 35.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
36. 36.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
37. 37.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) leave fridge door open (d) unplug idle chargers
39. 39.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
40. 40.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity

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