Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 36 · 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 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
2. 2.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
3. 3.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
4. 4.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
5. 5.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
7. 7.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
8. 8.🧾 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?
9. 9.True or false: to use LED lamps saves electricity. (a) True (b) False
10. 10.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
11. 11.Which of these saves electricity? (a) use daylight to read (b) iron one shirt at a time (c) leave fridge door open (d) use old filament bulbs
12. 12.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
13. 13.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
14. 14.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
15. 15.Which of these saves electricity? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave fridge door open (d) leave the TV on standby
16. 16.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
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 5 hours. How many watt-hours (Wh) are saved?
18. 18.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
19. 19.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
20. 20.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
21. 21.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
22. 22.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) iron one shirt at a time
23. 23.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) use daylight to read
24. 24.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
25. 25.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) unplug idle chargers
26. 26.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
27. 27.True or false: to use LED lamps wastes electricity. (a) False (b) True
28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
29. 29.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
30. 30.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) leave the TV on standby (d) set the AC to 24 °C
31. 31.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) use daylight to read
33. 33.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) use daylight to read (d) leave fridge door open
34. 34.True or false: to use old filament bulbs saves electricity. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) leave the TV on standby (d) use LED lamps
36. 36.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) switch off empty rooms (d) use daylight to read
37. 37.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
38. 38.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
39. 39.True or false: to close the fridge quickly saves electricity. (a) True (b) False
40. 40.🧾 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?

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