Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 208 · 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 use daylight to read? (a) wastes electricity (b) saves electricity
2. 2.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
3. 3.True or false: to unplug idle chargers saves electricity. (a) False (b) True
4. 4.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
5. 5.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) leave the TV on standby
6. 6.True or false: to use LED lamps saves electricity. (a) True (b) False
7. 7.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use daylight to read (d) use old filament bulbs
9. 9.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
10. 10.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
13. 13.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) switch off empty rooms (d) use daylight to read
14. 14.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) use LED lamps (d) leave the TV on standby
15. 15.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
16. 16.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) use LED lamps (d) set the AC to 24 °C
17. 17.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
18. 18.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
19. 19.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
20. 20.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
21. 21.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
22. 22.True or false: to use daylight to read saves electricity. (a) False (b) True
23. 23.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
24. 24.True or false: to leave fridge door open wastes electricity. (a) False (b) True
25. 25.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
26. 26.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) run fans in empty rooms (d) set the AC to 24 °C
27. 27.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) unplug idle chargers (d) set the AC to 24 °C
28. 28.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
29. 29.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) iron one shirt at a time (d) close the fridge quickly
30. 30.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
31. 31.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) set the AC to 24 °C
33. 33.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 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?
35. 35.True or false: to leave fridge door open saves electricity. (a) False (b) True
36. 36.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
37. 37.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
38. 38.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
39. 39.True or false: to switch off empty rooms saves electricity. (a) False (b) True
40. 40.True or false: to leave the TV on standby saves electricity. (a) True (b) False

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