Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 158 · 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) leave the TV on standby (b) use LED lamps (c) run fans in empty rooms (d) iron one shirt at a time
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
3. 3.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
4. 4.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
5. 5.True or false: to switch off empty rooms saves electricity. (a) False (b) True
6. 6.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
7. 7.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave the TV on standby (d) switch off empty rooms
8. 8.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
9. 9.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) switch off empty rooms (d) leave the TV on standby
11. 11.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) leave the TV on standby (d) unplug idle chargers
12. 12.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use daylight to read (d) run fans in empty rooms
13. 13.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave fridge door open
14. 14.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) use daylight to read (d) leave fridge door open
15. 15.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
16. 16.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
17. 17.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) iron one shirt at a time (d) switch off empty rooms
18. 18.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
19. 19.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
20. 20.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
21. 21.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) iron one shirt at a time
23. 23.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
24. 24.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
25. 25.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
27. 27.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) run fans in empty rooms (d) use daylight to read
28. 28.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) switch off empty rooms (d) unplug idle chargers
30. 30.🧾 A 250 W appliance runs for 10 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.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
33. 33.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
34. 34.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
35. 35.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
36. 36.🧾 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?
37. 37.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
38. 38.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
40. 40.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity

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