Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 423 · 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 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
2. 2.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
3. 3.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) unplug idle chargers
4. 4.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
5. 5.True or false: to use LED lamps saves electricity. (a) True (b) False
6. 6.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
7. 7.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
8. 8.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) use old filament bulbs (d) switch off empty rooms
9. 9.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
11. 11.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) run fans in empty rooms (d) iron one shirt at a time
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
13. 13.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
14. 14.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
15. 15.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
16. 16.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
17. 17.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) use daylight to read
18. 18.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
19. 19.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
20. 20.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
21. 21.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
22. 22.True or false: to use daylight to read saves electricity. (a) True (b) False
23. 23.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
25. 25.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.True or false: to use daylight to read wastes electricity. (a) True (b) False
27. 27.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
28. 28.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
30. 30.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
32. 32.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
33. 33.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) use LED lamps (d) use daylight to read
34. 34.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) iron one shirt at a time (d) use LED lamps
36. 36.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
37. 37.True or false: to use LED lamps wastes electricity. (a) True (b) False
38. 38.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?

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