Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 738 · 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) close the fridge quickly (c) use daylight to read (d) use old filament bulbs
2. 2.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
3. 3.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
4. 4.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
5. 5.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) run fans in empty rooms (d) close the fridge quickly
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
7. 7.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
8. 8.🧾 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?
9. 9.True or false: to use LED lamps wastes electricity. (a) True (b) False
10. 10.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
11. 11.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
13. 13.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) run fans in empty rooms (d) unplug idle chargers
15. 15.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
16. 16.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) switch off empty rooms (d) use daylight to read
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 6 hours. How many watt-hours (Wh) are saved?
18. 18.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) iron one shirt at a time
19. 19.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
20. 20.True or false: to leave fridge door open saves electricity. (a) True (b) False
21. 21.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) leave the TV on standby (d) switch off empty rooms
23. 23.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
24. 24.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use daylight to read (d) iron one shirt at a time
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
27. 27.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
28. 28.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
29. 29.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) switch off empty rooms (d) use old filament bulbs
31. 31.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
32. 32.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
33. 33.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
36. 36.True or false: to leave fridge door open wastes electricity. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) iron one shirt at a time
38. 38.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
39. 39.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 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?

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