Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 802 · 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 daylight to read (b) run fans in empty rooms (c) close the fridge quickly (d) use LED lamps
2. 2.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
3. 3.🧾 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
4. 4.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
5. 5.True or false: to close the fridge quickly saves electricity. (a) False (b) True
6. 6.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) use daylight to read (d) run fans in empty rooms
7. 7.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
8. 8.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
9. 9.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use daylight to read (d) switch off empty rooms
10. 10.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
11. 11.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
12. 12.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
13. 13.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
15. 15.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
16. 16.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
17. 17.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
18. 18.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
19. 19.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
20. 20.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
21. 21.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
22. 22.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
23. 23.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) run fans in empty rooms (d) leave the TV on standby
24. 24.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave fridge door open
27. 27.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) switch off empty rooms
29. 29.True or false: to use daylight to read saves electricity. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) use daylight to read (d) run fans in empty rooms
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) switch off empty rooms
32. 32.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) unplug idle chargers (d) leave the TV on standby
34. 34.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) set the AC to 24 °C (d) use LED lamps
35. 35.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) use old filament bulbs
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 4 hours. How many watt-hours (Wh) are saved?
37. 37.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
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 9 hours. How many watt-hours (Wh) are saved?
39. 39.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) run fans in empty rooms (d) leave fridge door open
40. 40.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity

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