Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 253 · 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.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
2. 2.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
3. 3.🧾 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?
4. 4.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
5. 5.🧾 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?
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
8. 8.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) close the fridge quickly (d) run fans in empty rooms
9. 9.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.🧾 A 100 W appliance runs for 5 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) leave the TV on standby (c) switch off empty rooms (d) use old filament bulbs
12. 12.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
13. 13.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
14. 14.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
15. 15.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave fridge door open (d) unplug idle chargers
16. 16.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
17. 17.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
18. 18.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
19. 19.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
20. 20.True or false: to close the fridge quickly saves electricity. (a) True (b) False
21. 21.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
22. 22.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave fridge door open
23. 23.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
24. 24.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
25. 25.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
26. 26.🧾 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?
27. 27.🧾 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?
28. 28.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use daylight to read (d) iron one shirt at a time
29. 29.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
30. 30.True or false: to leave the TV on standby saves electricity. (a) True (b) False
31. 31.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
32. 32.🔍 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) switch off empty rooms
33. 33.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
34. 34.True or false: to switch off empty rooms saves electricity. (a) False (b) True
35. 35.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
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 9 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
38. 38.🧾 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?
39. 39.Which of these wastes electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) switch off empty rooms (d) close the fridge quickly
40. 40.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

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