Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 242 · 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.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
3. 3.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) set the AC to 24 °C
4. 4.🧾 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?
5. 5.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) iron one shirt at a time (d) close the fridge quickly
6. 6.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
7. 7.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
9. 9.🧾 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
10. 10.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
11. 11.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
13. 13.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
14. 14.True or false: to use daylight to read saves electricity. (a) True (b) False
15. 15.🧾 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?
16. 16.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) switch off empty rooms (d) leave fridge door open
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 7 hours. How many watt-hours (Wh) are saved?
18. 18.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
19. 19.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
20. 20.True or false: to close the fridge quickly saves electricity. (a) False (b) True
21. 21.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
22. 22.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
23. 23.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
24. 24.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) run fans in empty rooms (d) leave the TV on standby
25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
26. 26.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
27. 27.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
29. 29.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
30. 30.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
31. 31.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
32. 32.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
33. 33.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
34. 34.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
36. 36.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
37. 37.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
38. 38.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
39. 39.🧾 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?
40. 40.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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