Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 993 · 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 daylight to read saves electricity. (a) False (b) True
2. 2.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
4. 4.True or false: to switch off empty rooms saves electricity. (a) True (b) False
5. 5.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) use old filament bulbs
6. 6.True or false: to unplug idle chargers saves electricity. (a) False (b) True
7. 7.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
8. 8.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
9. 9.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) close the fridge quickly
10. 10.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) leave the TV on standby (d) use daylight to read
11. 11.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) run fans in empty rooms (d) use old filament bulbs
12. 12.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) use old filament bulbs
13. 13.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
14. 14.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) switch off empty rooms (d) run fans in empty rooms
15. 15.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
17. 17.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
18. 18.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) unplug idle chargers
19. 19.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
20. 20.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
21. 21.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
22. 22.🧾 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?
23. 23.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
24. 24.🧾 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?
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
26. 26.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
27. 27.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
28. 28.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) use daylight to read
29. 29.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) run fans in empty rooms (d) use daylight to read
30. 30.🧾 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?
31. 31.True or false: to leave the TV on standby saves electricity. (a) True (b) False
32. 32.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
33. 33.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) use old filament bulbs (d) run fans in empty rooms
34. 34.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) close the fridge quickly
35. 35.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
36. 36.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
39. 39.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
40. 40.True or false: to use LED lamps wastes electricity. (a) False (b) True

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