Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 248 · 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 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
2. 2.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
3. 3.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
4. 4.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
5. 5.True or false: to use LED lamps saves electricity. (a) False (b) True
6. 6.Which of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) unplug idle chargers (d) set the AC to 24 °C
7. 7.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
8. 8.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
9. 9.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) unplug idle chargers
11. 11.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) close the fridge quickly (d) use old filament bulbs
12. 12.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) unplug idle chargers (d) set the AC to 24 °C
13. 13.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
14. 14.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
15. 15.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use LED lamps (d) use old filament bulbs
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
18. 18.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) close the fridge quickly (d) leave the TV on standby
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 10 hours. How many watt-hours (Wh) are saved?
20. 20.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
21. 21.🧾 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?
22. 22.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) use LED lamps (d) switch off empty rooms
24. 24.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
25. 25.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs
26. 26.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
27. 27.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
30. 30.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
31. 31.True or false: to close the fridge quickly saves electricity. (a) True (b) False
32. 32.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
33. 33.🧾 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?
34. 34.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) leave the TV on standby
35. 35.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
36. 36.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
37. 37.🧾 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?
38. 38.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
39. 39.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave fridge door open
40. 40.True or false: to use daylight to read wastes electricity. (a) True (b) False

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