Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 85 · 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.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
2. 2.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
3. 3.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
4. 4.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
5. 5.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
6. 6.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) leave fridge door open (d) leave the TV on standby
7. 7.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
9. 9.🧾 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?
10. 10.True or false: to use LED lamps wastes electricity. (a) True (b) False
11. 11.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
12. 12.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) close the fridge quickly (d) use daylight to read
13. 13.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use daylight to read (d) iron one shirt at a time
14. 14.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) switch off empty rooms
15. 15.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) close the fridge quickly (d) leave fridge door open
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
17. 17.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use daylight to read (d) iron one shirt at a time
18. 18.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
19. 19.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
20. 20.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
21. 21.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) unplug idle chargers
22. 22.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
23. 23.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) use daylight to read
24. 24.True or false: to leave the TV on standby saves electricity. (a) False (b) True
25. 25.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
26. 26.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) leave the TV on standby (d) switch off empty rooms
27. 27.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
28. 28.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
31. 31.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
32. 32.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) set the AC to 24 °C (d) run fans in empty rooms
33. 33.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
35. 35.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
36. 36.True or false: to leave fridge door open wastes electricity. (a) True (b) False
37. 37.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
39. 39.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) iron one shirt at a time
40. 40.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

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