Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 857 · 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 of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) leave the TV on standby
2. 2.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) unplug idle chargers (d) set the AC to 24 °C
3. 3.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
4. 4.Which of these saves electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) use old filament bulbs (d) leave the TV on standby
5. 5.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) use LED lamps (d) switch off empty rooms
6. 6.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 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?
8. 8.🧾 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?
9. 9.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) leave fridge door open
10. 10.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
11. 11.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
12. 12.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
13. 13.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) unplug idle chargers (d) use daylight to read
14. 14.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
15. 15.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
16. 16.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) switch off empty rooms (d) use LED lamps
18. 18.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
20. 20.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
21. 21.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
22. 22.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) leave fridge door open
23. 23.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
24. 24.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
26. 26.True or false: to close the fridge quickly saves electricity. (a) False (b) True
27. 27.True or false: to use daylight to read wastes electricity. (a) False (b) True
28. 28.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) switch off empty rooms
29. 29.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
30. 30.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) close the fridge quickly (d) run fans in empty rooms
31. 31.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
33. 33.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
34. 34.True or false: to unplug idle chargers saves electricity. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) leave the TV on standby (d) iron one shirt at a time
36. 36.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
37. 37.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
38. 38.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
39. 39.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
40. 40.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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