Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 221 · 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) saves electricity (b) wastes electricity
2. 2.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) use daylight to read
3. 3.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
4. 4.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
5. 5.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
6. 6.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
9. 9.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
10. 10.True or false: to close the fridge quickly saves electricity. (a) True (b) False
11. 11.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
12. 12.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) use LED lamps (d) run fans in empty rooms
13. 13.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
14. 14.Which of these saves electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) iron one shirt at a time (d) use old filament bulbs
15. 15.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
16. 16.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
17. 17.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
18. 18.True or false: to use daylight to read saves electricity. (a) False (b) True
19. 19.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) use old filament bulbs (d) set the AC to 24 °C
20. 20.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use daylight to read (d) leave fridge door open
21. 21.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
22. 22.True or false: to unplug idle chargers saves electricity. (a) False (b) True
23. 23.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
24. 24.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
25. 25.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) use daylight to read (d) leave the TV on standby
27. 27.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
28. 28.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
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 5 hours. How many watt-hours (Wh) are saved?
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 1 hour. How many watt-hours (Wh) are saved?
35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
37. 37.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) run fans in empty rooms (d) close the fridge quickly
38. 38.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave the TV on standby (d) leave fridge door open
39. 39.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) close the fridge quickly
40. 40.True or false: to switch off empty rooms saves electricity. (a) True (b) False

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