Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 123 · 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) set the AC to 24 °C (b) iron one shirt at a time (c) use daylight to read (d) unplug idle chargers
2. 2.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) use daylight to read
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
4. 4.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
5. 5.🧾 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?
6. 6.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
7. 7.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) use old filament bulbs (d) leave fridge door open
8. 8.Which of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) switch off empty rooms (d) set the AC to 24 °C
9. 9.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) switch off empty rooms (d) run fans in empty rooms
10. 10.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) leave the TV on standby (d) iron one shirt at a time
11. 11.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
12. 12.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
14. 14.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
15. 15.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
17. 17.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
18. 18.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
19. 19.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
20. 20.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
21. 21.Which of these wastes electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) switch off empty rooms (d) use LED lamps
22. 22.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
24. 24.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
25. 25.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
27. 27.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
28. 28.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
29. 29.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) close the fridge quickly (d) use LED lamps
31. 31.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use daylight to read (d) leave fridge door open
32. 32.True or false: to unplug idle chargers saves electricity. (a) True (b) False
33. 33.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
34. 34.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) unplug idle chargers (d) leave the TV on standby
35. 35.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.True or false: to leave fridge door open saves electricity. (a) False (b) True
37. 37.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
38. 38.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
39. 39.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
40. 40.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity

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