Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 61 · 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.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
2. 2.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) switch off empty rooms (d) iron one shirt at a time
3. 3.True or false: to unplug idle chargers saves electricity. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) use LED lamps (d) use daylight to read
5. 5.🧾 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
6. 6.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
7. 7.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.True or false: to use LED lamps saves electricity. (a) True (b) False
9. 9.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
11. 11.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) iron one shirt at a time (d) set the AC to 24 °C
12. 12.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) iron one shirt at a time (d) leave the TV on standby
13. 13.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
14. 14.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) leave the TV on standby (d) switch off empty rooms
15. 15.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) close the fridge quickly
17. 17.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
18. 18.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) set the AC to 24 °C (d) use daylight to read
20. 20.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
21. 21.Which of these wastes electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) use LED lamps (d) unplug idle chargers
22. 22.True or false: to use old filament bulbs saves electricity. (a) True (b) False
23. 23.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
26. 26.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
27. 27.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) leave the TV on standby (d) leave fridge door open
30. 30.🧾 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?
31. 31.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) use LED lamps (d) leave fridge door open
32. 32.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) use LED lamps
33. 33.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
34. 34.Which of these saves electricity? (a) use daylight to read (b) leave the TV on standby (c) iron one shirt at a time (d) leave fridge door open
35. 35.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
36. 36.True or false: to use LED lamps wastes electricity. (a) True (b) False
37. 37.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) leave the TV on standby (d) run fans in empty rooms
38. 38.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
39. 39.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
40. 40.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

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