Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 237 · 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.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) leave the TV on standby (d) leave fridge door open
2. 2.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
5. 5.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
7. 7.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
8. 8.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) leave the TV on standby
9. 9.🧾 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?
10. 10.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
11. 11.🧾 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
12. 12.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
13. 13.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) switch off empty rooms
14. 14.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
15. 15.True or false: to leave fridge door open saves electricity. (a) True (b) False
16. 16.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) unplug idle chargers
17. 17.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
18. 18.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) switch off empty rooms (d) set the AC to 24 °C
19. 19.🧾 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?
20. 20.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) iron one shirt at a time (d) use daylight to read
21. 21.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) use daylight to read (d) leave fridge door open
22. 22.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
24. 24.True or false: to leave fridge door open wastes electricity. (a) True (b) False
25. 25.True or false: to close the fridge quickly saves electricity. (a) True (b) False
26. 26.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
27. 27.Which of these wastes electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) close the fridge quickly (d) unplug idle chargers
28. 28.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
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 9 hours. How many watt-hours (Wh) are saved?
33. 33.🔍 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
34. 34.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) switch off empty rooms (d) run fans in empty rooms
35. 35.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
36. 36.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
37. 37.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
38. 38.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) set the AC to 24 °C
39. 39.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) close the fridge quickly (d) set the AC to 24 °C
40. 40.True or false: to switch off empty rooms saves electricity. (a) False (b) True

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