Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 157 · 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 use old filament bulbs saves electricity. (a) True (b) False
2. 2.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) use daylight to read
3. 3.True or false: to leave fridge door open saves electricity. (a) True (b) False
4. 4.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
5. 5.True or false: to leave the TV on standby saves electricity. (a) True (b) False
6. 6.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) use daylight to read (d) use LED lamps
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) leave fridge door open
8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
9. 9.🧾 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?
10. 10.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
12. 12.True or false: to use daylight to read saves electricity. (a) True (b) False
13. 13.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) switch off empty rooms (d) run fans in empty rooms
14. 14.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) use daylight to read (d) set the AC to 24 °C
15. 15.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
16. 16.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
17. 17.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
18. 18.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
19. 19.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
20. 20.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
22. 22.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
23. 23.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
24. 24.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
25. 25.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) use daylight to read (d) switch off empty rooms
26. 26.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
27. 27.🧾 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?
28. 28.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) run fans in empty rooms (d) use LED lamps
29. 29.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
30. 30.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) leave the TV on standby (d) use LED lamps
31. 31.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) switch off empty rooms
34. 34.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
35. 35.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
36. 36.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) set the AC to 24 °C (d) run fans in empty rooms
37. 37.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
38. 38.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) use LED lamps (d) close the fridge quickly
40. 40.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) run fans in empty rooms (d) leave fridge door open

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