Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 161 · 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 leave the TV on standby? (a) wastes electricity (b) saves electricity
2. 2.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) leave fridge door open (d) use LED lamps
3. 3.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
4. 4.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
5. 5.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
6. 6.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
7. 7.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
8. 8.True or false: to leave fridge door open wastes electricity. (a) False (b) True
9. 9.🧾 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?
10. 10.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) run fans in empty rooms (d) iron one shirt at a time
11. 11.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
13. 13.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
14. 14.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) use LED lamps (d) switch off empty rooms
15. 15.🧾 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?
16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
17. 17.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
18. 18.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
20. 20.True or false: to use LED lamps saves electricity. (a) False (b) True
21. 21.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) unplug idle chargers
22. 22.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
24. 24.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
25. 25.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) unplug idle chargers
26. 26.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
27. 27.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) iron one shirt at a time (d) use LED lamps
28. 28.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
30. 30.True or false: to leave the TV on standby saves electricity. (a) False (b) True
31. 31.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
32. 32.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
33. 33.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
34. 34.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) switch off empty rooms (d) set the AC to 24 °C
35. 35.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
36. 36.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) iron one shirt at a time (d) use LED lamps
37. 37.True or false: to unplug idle chargers saves electricity. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
39. 39.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
40. 40.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

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