Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 703 · 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 wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) iron one shirt at a time (d) close the fridge quickly
2. 2.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
3. 3.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
5. 5.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
6. 6.True or false: to leave fridge door open saves electricity. (a) False (b) True
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 7 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 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?
9. 9.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
10. 10.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
11. 11.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
13. 13.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) unplug idle chargers (d) use daylight to read
14. 14.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
15. 15.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
17. 17.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) use old filament bulbs (d) leave fridge door open
19. 19.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) unplug idle chargers (d) use old filament bulbs
21. 21.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) switch off empty rooms (d) leave the TV on standby
23. 23.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
24. 24.True or false: to use old filament bulbs saves electricity. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) iron one shirt at a time (d) run fans in empty rooms
26. 26.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) leave fridge door open (d) leave the TV on standby
27. 27.True or false: to leave the TV on standby saves electricity. (a) False (b) True
28. 28.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use daylight to read (d) leave the TV on standby
30. 30.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) unplug idle chargers
32. 32.🧾 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?
33. 33.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) leave fridge door open (d) set the AC to 24 °C
34. 34.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) unplug idle chargers (d) iron one shirt at a time
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 10 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
38. 38.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
39. 39.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) use daylight to read (d) leave the TV on standby

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