Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 481 · 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 saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use daylight to read (d) run fans in empty rooms
2. 2.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
3. 3.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) use daylight to read
4. 4.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) use old filament bulbs
5. 5.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) use old filament bulbs (d) run fans in empty rooms
6. 6.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) use LED lamps (d) use daylight to read
7. 7.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
8. 8.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
9. 9.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) iron one shirt at a time (d) close the fridge quickly
10. 10.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
12. 12.True or false: to use daylight to read wastes electricity. (a) False (b) True
13. 13.True or false: to use daylight to read saves electricity. (a) False (b) True
14. 14.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
15. 15.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) unplug idle chargers (d) use old filament bulbs
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) switch off empty rooms
17. 17.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) unplug idle chargers (d) iron one shirt at a time
19. 19.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
20. 20.🧾 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?
21. 21.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.True or false: to leave the TV on standby saves electricity. (a) True (b) False
23. 23.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
24. 24.True or false: to switch off empty rooms saves electricity. (a) False (b) True
25. 25.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
26. 26.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
27. 27.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) use LED lamps (d) use daylight to read
28. 28.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) leave fridge door open (d) iron one shirt at a time
30. 30.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
31. 31.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
32. 32.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
34. 34.💡 Does it save or waste electricity to switch off 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 7 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) set the AC to 24 °C (d) run fans in empty rooms
38. 38.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?

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