Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 946 · 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.True or false: to switch off empty rooms saves electricity. (a) False (b) True
2. 2.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) iron one shirt at a time (d) run fans in empty rooms
3. 3.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
4. 4.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) iron one shirt at a time (d) leave the TV on standby
5. 5.Which of these saves electricity? (a) use daylight to read (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs
6. 6.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
7. 7.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
8. 8.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
9. 9.🧾 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?
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
11. 11.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
13. 13.🧾 A family uses 130 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) iron one shirt at a time (b) leave fridge door open (c) set the AC to 24 °C (d) run fans in empty rooms
15. 15.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) set the AC to 24 °C (d) unplug idle chargers
16. 16.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) use LED lamps
17. 17.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
18. 18.True or false: to close the fridge quickly saves electricity. (a) False (b) True
19. 19.True or false: to leave fridge door open wastes electricity. (a) True (b) False
20. 20.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 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
22. 22.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
24. 24.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) use LED lamps
26. 26.True or false: to use LED lamps saves electricity. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) use old filament bulbs (d) switch off empty rooms
28. 28.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
29. 29.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
30. 30.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.True or false: to unplug idle chargers saves electricity. (a) True (b) False
33. 33.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
34. 34.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
35. 35.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) run fans in empty rooms (d) set the AC to 24 °C
36. 36.🧾 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?
37. 37.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
38. 38.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) use LED lamps (d) switch off empty rooms
39. 39.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) use old filament bulbs

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