Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 3 · 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.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
2. 2.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
3. 3.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) run fans in empty rooms (d) leave fridge door open
4. 4.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) use LED lamps (d) iron one shirt at a time
5. 5.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
6. 6.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) use LED lamps (d) use daylight to read
7. 7.🔍 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) use old filament bulbs
8. 8.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
10. 10.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) use LED lamps
12. 12.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
14. 14.🧾 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?
15. 15.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
16. 16.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) leave fridge door open (d) iron one shirt at a time
17. 17.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) use old filament bulbs
19. 19.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) use LED lamps
20. 20.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) leave the TV on standby (d) switch off empty rooms
21. 21.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
22. 22.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
24. 24.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
25. 25.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
27. 27.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these saves electricity? (a) use old filament bulbs (b) switch off empty rooms (c) leave fridge door open (d) leave the TV on standby
29. 29.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) switch off empty rooms (d) run fans in empty rooms
30. 30.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
31. 31.True or false: to switch off empty rooms saves electricity. (a) True (b) False
32. 32.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
33. 33.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.True or false: to leave the TV on standby saves electricity. (a) True (b) False
36. 36.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
38. 38.🧾 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?
39. 39.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
40. 40.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity

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