Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 292 · 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) run fans in empty rooms (b) use LED lamps (c) close the fridge quickly (d) unplug idle chargers
2. 2.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) use daylight to read
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
4. 4.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
5. 5.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
6. 6.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) run fans in empty rooms (d) leave fridge door open
7. 7.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) unplug idle chargers (d) close the fridge quickly
8. 8.True or false: to use old filament bulbs saves electricity. (a) False (b) True
9. 9.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) use daylight to read
11. 11.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
13. 13.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
14. 14.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) use daylight to read (d) leave the TV on standby
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) leave fridge door open (d) leave the TV on standby
16. 16.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) close the fridge quickly (d) switch off empty rooms
17. 17.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
18. 18.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
19. 19.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
20. 20.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) close the fridge quickly
21. 21.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
22. 22.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use daylight to read (d) run fans in empty rooms
23. 23.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
27. 27.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
28. 28.🧾 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?
29. 29.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) use LED lamps (d) unplug idle chargers
30. 30.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
31. 31.True or false: to switch off empty rooms saves electricity. (a) False (b) True
32. 32.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to use LED lamps saves electricity. (a) False (b) True
34. 34.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
35. 35.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
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 6 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
38. 38.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
39. 39.Which of these wastes electricity? (a) use daylight to read (b) use old filament bulbs (c) use LED lamps (d) switch off empty rooms
40. 40.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

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