Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 95 · 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) use daylight to read (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
2. 2.🧾 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?
3. 3.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
4. 4.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
5. 5.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) close the fridge quickly (d) unplug idle chargers
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 6 hours. How many watt-hours (Wh) are saved?
7. 7.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
8. 8.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
10. 10.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) use daylight to read (d) set the AC to 24 °C
13. 13.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
14. 14.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) iron one shirt at a time (d) leave fridge door open
15. 15.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) leave fridge door open (d) switch off empty rooms
16. 16.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) use old filament bulbs
17. 17.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
18. 18.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) switch off empty rooms (d) use LED lamps
19. 19.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave the TV on standby (d) use daylight to read
20. 20.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
21. 21.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
22. 22.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use daylight to read (d) use old filament bulbs
23. 23.True or false: to switch off empty rooms saves electricity. (a) True (b) False
24. 24.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
25. 25.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) use daylight to read (d) run fans in empty rooms
26. 26.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
29. 29.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to use LED lamps saves electricity. (a) True (b) False
31. 31.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
33. 33.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
34. 34.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
35. 35.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
37. 37.🧾 A family uses 80 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 switch off empty rooms? (a) wastes electricity (b) saves electricity
39. 39.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) switch off empty rooms (d) iron one shirt at a time
40. 40.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) use daylight to read (d) close the fridge quickly

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