Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 660 · 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.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
2. 2.True or false: to leave the TV on standby saves electricity. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) unplug idle chargers (d) run fans in empty rooms
4. 4.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
5. 5.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
6. 6.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
8. 8.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) use old filament bulbs
9. 9.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
10. 10.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) unplug idle chargers (d) use daylight to read
11. 11.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
12. 12.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
13. 13.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) unplug idle chargers (d) set the AC to 24 °C
14. 14.True or false: to use daylight to read wastes electricity. (a) True (b) False
15. 15.🧾 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
16. 16.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
18. 18.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
19. 19.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
20. 20.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) run fans in empty rooms
21. 21.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) switch off empty rooms (d) use daylight to read
22. 22.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
24. 24.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
25. 25.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
28. 28.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
29. 29.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
32. 32.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
33. 33.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
35. 35.🧾 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?
36. 36.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) switch off empty rooms (d) run fans in empty rooms
39. 39.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) iron one shirt at a time

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