Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 464 · 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 LED lamps (b) set the AC to 24 °C (c) iron one shirt at a time (d) unplug idle chargers
2. 2.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) use LED lamps (d) run fans in empty rooms
3. 3.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
5. 5.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
6. 6.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
7. 7.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) use daylight to read (d) set the AC to 24 °C
8. 8.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
9. 9.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
10. 10.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) use old filament bulbs (d) leave fridge door open
11. 11.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave the TV on standby
12. 12.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
13. 13.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) iron one shirt at a time (d) use old filament bulbs
14. 14.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
15. 15.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) unplug idle chargers
17. 17.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
18. 18.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
19. 19.True or false: to leave fridge door open saves electricity. (a) False (b) True
20. 20.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
21. 21.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
22. 22.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
23. 23.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) use LED lamps
24. 24.True or false: to switch off empty rooms saves electricity. (a) False (b) True
25. 25.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
27. 27.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
28. 28.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
29. 29.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
30. 30.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
32. 32.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) switch off empty rooms (d) leave fridge door open
33. 33.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
34. 34.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) use daylight to read (d) use LED lamps
35. 35.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
36. 36.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
37. 37.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) use daylight to read (d) switch off empty rooms
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 lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
40. 40.True or false: to iron one shirt at a time saves electricity. (a) False (b) True

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