Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 370 · 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.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
2. 2.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) leave the TV on standby (d) use daylight to read
3. 3.🧾 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?
4. 4.🧾 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
5. 5.True or false: to use LED lamps wastes electricity. (a) True (b) False
6. 6.True or false: to close the fridge quickly saves electricity. (a) False (b) True
7. 7.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
8. 8.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
11. 11.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
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 3 hours. How many watt-hours (Wh) are saved?
13. 13.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) iron one shirt at a time (d) close the fridge quickly
15. 15.Which of these saves electricity? (a) use daylight to read (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
16. 16.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 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?
18. 18.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) set the AC to 24 °C (d) iron one shirt at a time
19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
20. 20.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
21. 21.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) unplug idle chargers (d) use LED lamps
22. 22.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
23. 23.🧾 A 500 W appliance runs for 5 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 4 hours. How many watt-hours (Wh) are saved?
25. 25.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
27. 27.Which of these wastes electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) use daylight to read (d) unplug idle chargers
28. 28.True or false: to leave the TV on standby saves electricity. (a) True (b) False
29. 29.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
30. 30.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
31. 31.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) switch off empty rooms (d) use old filament bulbs
32. 32.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
33. 33.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) leave the TV on standby (d) set the AC to 24 °C
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.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
36. 36.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) run fans in empty rooms (d) use daylight to read
37. 37.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use daylight to read (d) leave the TV on standby
38. 38.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
39. 39.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
40. 40.True or false: to leave fridge door open saves electricity. (a) False (b) True

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