Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 173 · 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 use daylight to read saves electricity. (a) True (b) False
2. 2.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) unplug idle chargers (d) run fans in empty rooms
3. 3.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
4. 4.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) set the AC to 24 °C (d) leave the TV on standby
5. 5.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
7. 7.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
8. 8.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
9. 9.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
12. 12.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
13. 13.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) switch off empty rooms
15. 15.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
16. 16.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) leave fridge door open (d) switch off empty rooms
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 8 hours. How many watt-hours (Wh) are saved?
18. 18.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use daylight to read (d) leave fridge door open
19. 19.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
20. 20.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
21. 21.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
22. 22.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) use LED lamps (d) use daylight to read
23. 23.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
24. 24.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
26. 26.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
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 5 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) run fans in empty rooms (d) iron one shirt at a time
30. 30.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
31. 31.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
32. 32.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) run fans in empty rooms (d) close the fridge quickly
33. 33.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
34. 34.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) use LED lamps (d) close the fridge quickly
35. 35.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
36. 36.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) close the fridge quickly (d) run fans in empty rooms
37. 37.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) run fans in empty rooms (d) leave the TV on standby
38. 38.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
39. 39.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
40. 40.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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