Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 681 · 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 lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
2. 2.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) leave fridge door open (d) use daylight to read
3. 3.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
4. 4.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) iron one shirt at a time (d) use LED lamps
5. 5.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) iron one shirt at a time
6. 6.🧾 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?
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
8. 8.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
10. 10.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
13. 13.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) use old filament bulbs (d) use LED lamps
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 is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) use LED lamps
16. 16.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) switch off empty rooms (d) leave the TV on standby
17. 17.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) use LED lamps (d) use daylight to read
18. 18.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) iron one shirt at a time (d) run fans in empty rooms
19. 19.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) close the fridge quickly (d) unplug idle chargers
20. 20.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave fridge door open (d) iron one shirt at a time
21. 21.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
22. 22.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
23. 23.True or false: to leave fridge door open saves electricity. (a) True (b) False
24. 24.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) use LED lamps (d) set the AC to 24 °C
25. 25.True or false: to switch off empty rooms saves electricity. (a) False (b) True
26. 26.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 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?
29. 29.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) use daylight to read
31. 31.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) run fans in empty rooms
32. 32.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
33. 33.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
35. 35.🧾 A family uses 60 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) set the AC to 24 °C
37. 37.🧾 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?
38. 38.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 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?
40. 40.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

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