Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 914 · 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.True or false: to switch off empty rooms saves electricity. (a) False (b) True
2. 2.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
3. 3.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
4. 4.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
5. 5.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) unplug idle chargers (d) leave the TV on standby
6. 6.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) leave fridge door open (d) set the AC to 24 °C
7. 7.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
8. 8.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
10. 10.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
12. 12.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
14. 14.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) use daylight to read (d) unplug idle chargers
15. 15.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) unplug idle chargers (d) use old filament bulbs
16. 16.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use daylight to read (d) use old filament bulbs
17. 17.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
18. 18.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
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 9 hours. How many watt-hours (Wh) are saved?
20. 20.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) run fans in empty rooms
22. 22.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
23. 23.True or false: to use LED lamps wastes electricity. (a) False (b) True
24. 24.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
25. 25.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
26. 26.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) use LED lamps (d) iron one shirt at a time
28. 28.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
29. 29.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
31. 31.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
32. 32.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
35. 35.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) iron one shirt at a time
37. 37.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
39. 39.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
40. 40.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

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