Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 462 · 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.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
2. 2.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
3. 3.True or false: to switch off empty rooms saves electricity. (a) False (b) True
4. 4.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
5. 5.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) unplug idle chargers (d) use daylight to read
6. 6.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
8. 8.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
9. 9.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
10. 10.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
11. 11.True or false: to unplug idle chargers saves electricity. (a) False (b) True
12. 12.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
13. 13.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
14. 14.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
15. 15.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
17. 17.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
18. 18.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
19. 19.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
20. 20.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
21. 21.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
22. 22.True or false: to use old filament bulbs saves electricity. (a) True (b) False
23. 23.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
24. 24.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
25. 25.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) iron one shirt at a time (d) use daylight to read
26. 26.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
28. 28.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
29. 29.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) set the AC to 24 °C (d) switch off empty rooms
30. 30.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers
31. 31.Which of these wastes electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) use daylight to read (d) switch off empty rooms
32. 32.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
33. 33.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) run fans in empty rooms
35. 35.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
36. 36.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) close the fridge quickly (d) run fans in empty rooms
37. 37.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
38. 38.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
39. 39.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?

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