Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 905 · 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 unplug idle chargers wastes electricity. (a) True (b) False
2. 2.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) use daylight to read (d) set the AC to 24 °C
3. 3.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
4. 4.True or false: to use old filament bulbs saves electricity. (a) False (b) True
5. 5.True or false: to unplug idle chargers saves electricity. (a) True (b) False
6. 6.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
7. 7.True or false: to use daylight to read wastes electricity. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
9. 9.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
11. 11.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
12. 12.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
13. 13.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) run fans in empty rooms (d) use old filament bulbs
14. 14.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use daylight to read (d) leave fridge door open
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
16. 16.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.True or false: to leave the TV on standby saves electricity. (a) True (b) False
18. 18.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) unplug idle chargers (d) run fans in empty rooms
19. 19.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
20. 20.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
21. 21.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) switch off empty rooms
22. 22.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
23. 23.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
25. 25.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
26. 26.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) close the fridge quickly (d) leave fridge door open
27. 27.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
28. 28.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
30. 30.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
31. 31.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) unplug idle chargers (d) set the AC to 24 °C
32. 32.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.Which of these wastes electricity? (a) use daylight to read (b) use old filament bulbs (c) close the fridge quickly (d) unplug idle chargers
34. 34.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
35. 35.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
36. 36.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
37. 37.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
38. 38.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
40. 40.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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