Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 655 · 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 set the AC to 24 °C? (a) saves electricity (b) wastes electricity
2. 2.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) leave fridge door open
3. 3.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
5. 5.🧾 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?
6. 6.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
7. 7.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
9. 9.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
10. 10.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
11. 11.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) set the AC to 24 °C
12. 12.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) close the fridge quickly (d) use old filament bulbs
13. 13.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
14. 14.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
15. 15.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
16. 16.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) switch off empty rooms
17. 17.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
18. 18.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) unplug idle chargers (d) use old filament bulbs
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 run fans in empty rooms? (a) wastes electricity (b) saves electricity
21. 21.True or false: to unplug idle chargers saves electricity. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) unplug idle chargers (d) leave the TV on standby
23. 23.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) leave the TV on standby
24. 24.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
25. 25.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
26. 26.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
27. 27.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
28. 28.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
29. 29.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) use daylight to read (d) unplug idle chargers
30. 30.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
32. 32.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use LED lamps (d) use daylight to read
33. 33.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.True or false: to use LED lamps wastes electricity. (a) True (b) False
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 7 hours. How many watt-hours (Wh) are saved?
37. 37.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
38. 38.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
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 3 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

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