Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 794 · 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 is the odd one out? (a) use daylight to read (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
2. 2.Which of these wastes electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) switch off empty rooms (d) use LED lamps
3. 3.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
5. 5.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
6. 6.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
7. 7.🧾 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?
8. 8.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
10. 10.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
11. 11.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) use daylight to read (d) leave the TV on standby
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
14. 14.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) switch off empty rooms (d) close the fridge quickly
16. 16.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) leave the TV on standby (d) switch off empty rooms
17. 17.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
18. 18.True or false: to switch off empty rooms saves electricity. (a) False (b) True
19. 19.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
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 9 hours. How many watt-hours (Wh) are saved?
21. 21.Which of these saves electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
22. 22.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
23. 23.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
24. 24.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
25. 25.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
26. 26.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
27. 27.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
28. 28.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) set the AC to 24 °C (d) switch off empty rooms
30. 30.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
32. 32.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
33. 33.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
35. 35.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.🧾 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?
37. 37.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) run fans in empty rooms (d) use old filament bulbs
39. 39.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
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 10 hours. How many watt-hours (Wh) are saved?

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