Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 280 · 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.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
2. 2.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
3. 3.🔍 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 the TV on standby
4. 4.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
5. 5.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
7. 7.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) close the fridge quickly
8. 8.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
9. 9.True or false: to leave fridge door open saves electricity. (a) False (b) True
10. 10.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
12. 12.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
13. 13.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
14. 14.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) use daylight to read (d) set the AC to 24 °C
16. 16.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
18. 18.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
19. 19.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
20. 20.True or false: to use LED lamps wastes electricity. (a) True (b) False
21. 21.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
22. 22.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
24. 24.🧾 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?
25. 25.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
26. 26.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) iron one shirt at a time (d) use old filament bulbs
27. 27.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use LED lamps (d) leave the TV on standby
28. 28.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) unplug idle chargers (d) switch off empty rooms
29. 29.🧾 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?
30. 30.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) run fans in empty rooms (d) leave fridge door open
32. 32.Which of these wastes electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) set the AC to 24 °C (d) use daylight to read
33. 33.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) unplug idle chargers
34. 34.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
35. 35.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
36. 36.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) switch off empty rooms (d) leave the TV on standby
37. 37.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.True or false: to use daylight to read wastes electricity. (a) False (b) True
39. 39.True or false: to leave fridge door open wastes electricity. (a) True (b) False
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 3 hours. How many watt-hours (Wh) are saved?

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