Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 999 · 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) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) use daylight to read
2. 2.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
5. 5.True or false: to leave fridge door open saves electricity. (a) True (b) False
6. 6.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
7. 7.True or false: to use daylight to read wastes electricity. (a) False (b) True
8. 8.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
9. 9.True or false: to close the fridge quickly saves electricity. (a) True (b) False
10. 10.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) unplug idle chargers (d) iron one shirt at a time
11. 11.🧾 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?
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
13. 13.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) unplug idle chargers
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) leave fridge door open (d) iron one shirt at a time
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
17. 17.True or false: to switch off empty rooms saves electricity. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) run fans in empty rooms
19. 19.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
20. 20.🔍 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) close the fridge quickly
21. 21.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) leave fridge door open
22. 22.True or false: to leave the TV on standby saves electricity. (a) False (b) True
23. 23.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) set the AC to 24 °C (d) run fans in empty rooms
24. 24.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
25. 25.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
26. 26.True or false: to use daylight to read saves electricity. (a) False (b) True
27. 27.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to unplug idle chargers saves electricity. (a) True (b) False
29. 29.🧾 A family uses 200 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 the TV on standby? (a) saves electricity (b) wastes electricity
31. 31.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) unplug idle chargers (d) switch off empty rooms
32. 32.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) switch off empty rooms (d) use daylight to read
33. 33.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) unplug idle chargers (d) run fans in empty rooms
34. 34.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) use old filament bulbs (d) leave fridge door open
35. 35.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) set the AC to 24 °C
36. 36.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) leave fridge door open (d) iron one shirt at a time
37. 37.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
38. 38.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
39. 39.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?

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