Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 544 · 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 leave fridge door open wastes electricity. (a) False (b) True
2. 2.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
3. 3.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
5. 5.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
6. 6.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
7. 7.True or false: to unplug idle chargers saves electricity. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) unplug idle chargers (d) set the AC to 24 °C
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
10. 10.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
12. 12.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) use LED lamps
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) leave fridge door open (d) use old filament bulbs
14. 14.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
15. 15.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
16. 16.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
17. 17.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
18. 18.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
19. 19.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
20. 20.Which of these saves electricity? (a) use old filament bulbs (b) use daylight to read (c) leave fridge door open (d) iron one shirt at a time
21. 21.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) leave fridge door open (d) iron one shirt at a time
23. 23.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) use old filament bulbs (d) switch off empty rooms
25. 25.True or false: to leave the TV on standby saves electricity. (a) True (b) False
26. 26.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
27. 27.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) unplug idle chargers (d) run fans in empty rooms
28. 28.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) iron one shirt at a time (d) leave fridge door open
29. 29.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) leave the TV on standby (d) run fans in empty rooms
30. 30.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) close the fridge quickly (d) use LED lamps
32. 32.True or false: to close the fridge quickly saves electricity. (a) True (b) False
33. 33.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
35. 35.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use daylight to read (d) leave fridge door open
37. 37.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
38. 38.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
40. 40.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity

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