Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 137 · 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 is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use LED lamps (d) use old filament bulbs
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
3. 3.🧾 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
4. 4.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) use old filament bulbs (d) switch off empty rooms
5. 5.True or false: to use LED lamps wastes electricity. (a) False (b) True
6. 6.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
7. 7.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
8. 8.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
9. 9.True or false: to leave fridge door open wastes electricity. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) use daylight to read (d) run fans in empty rooms
11. 11.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
12. 12.🧾 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?
13. 13.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
14. 14.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
15. 15.True or false: to close the fridge quickly saves electricity. (a) True (b) False
16. 16.True or false: to use old filament bulbs saves electricity. (a) True (b) False
17. 17.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
18. 18.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
19. 19.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) close the fridge quickly
20. 20.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
21. 21.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
22. 22.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 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?
25. 25.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) close the fridge quickly (d) unplug idle chargers
26. 26.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
27. 27.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
29. 29.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
30. 30.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
32. 32.True or false: to use daylight to read wastes electricity. (a) False (b) True
33. 33.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) unplug idle chargers (d) use daylight to read
36. 36.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
37. 37.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
39. 39.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

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