Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 945 · 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 of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) use old filament bulbs (d) run fans in empty rooms
2. 2.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
3. 3.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use old filament bulbs (d) use LED lamps
4. 4.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
5. 5.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) unplug idle chargers (d) set the AC to 24 °C
6. 6.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) switch off empty rooms (d) unplug idle chargers
7. 7.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
9. 9.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
10. 10.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
11. 11.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
12. 12.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
13. 13.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
15. 15.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
16. 16.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) close the fridge quickly (d) run fans in empty rooms
17. 17.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
19. 19.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
20. 20.Which of these wastes electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) unplug idle chargers (d) close the fridge quickly
21. 21.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
23. 23.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave the TV on standby (d) use daylight to read
24. 24.🧾 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?
25. 25.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
26. 26.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) leave fridge door open (d) unplug idle chargers
27. 27.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
28. 28.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) use old filament bulbs (d) leave the TV on standby
29. 29.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
30. 30.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
32. 32.True or false: to leave fridge door open saves electricity. (a) True (b) False
33. 33.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
34. 34.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
35. 35.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
36. 36.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
37. 37.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
38. 38.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
39. 39.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
40. 40.True or false: to use LED lamps saves electricity. (a) False (b) True

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