Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 872 · 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.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
2. 2.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) use old filament bulbs (d) close the fridge quickly
3. 3.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
4. 4.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) iron one shirt at a time
5. 5.True or false: to close the fridge quickly saves electricity. (a) True (b) False
6. 6.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
7. 7.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) use LED lamps
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
9. 9.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) use LED lamps (d) close the fridge quickly
10. 10.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
11. 11.🧾 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?
12. 12.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) use LED lamps (d) run fans in empty rooms
13. 13.True or false: to use daylight to read wastes electricity. (a) True (b) False
14. 14.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
15. 15.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) set the AC to 24 °C
16. 16.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
17. 17.Which of these wastes electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) unplug idle chargers (d) use daylight to read
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
19. 19.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
20. 20.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
21. 21.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) switch off empty rooms (d) iron one shirt at a time
22. 22.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
25. 25.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
26. 26.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
27. 27.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
29. 29.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) iron one shirt at a time (d) unplug idle chargers
30. 30.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
31. 31.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
32. 32.True or false: to switch off empty rooms saves electricity. (a) False (b) True
33. 33.🧾 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?
34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
35. 35.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
36. 36.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs
37. 37.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
38. 38.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) leave the TV on standby (d) close the fridge quickly
39. 39.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to use daylight to read saves electricity. (a) True (b) False

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