Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 362 · 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.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
3. 3.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
4. 4.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
5. 5.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
6. 6.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) iron one shirt at a time (d) unplug idle chargers
7. 7.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) iron one shirt at a time
8. 8.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) close the fridge quickly (d) use LED lamps
9. 9.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) iron one shirt at a time (d) run fans in empty rooms
10. 10.True or false: to leave fridge door open saves electricity. (a) False (b) True
11. 11.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
13. 13.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
14. 14.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
15. 15.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
16. 16.🧾 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?
17. 17.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) switch off empty rooms (d) leave the TV on standby
18. 18.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
19. 19.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) run fans in empty rooms (d) use LED lamps
20. 20.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) use LED lamps
23. 23.🧾 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
24. 24.Which of these wastes electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) set the AC to 24 °C (d) unplug idle chargers
25. 25.True or false: to close the fridge quickly saves electricity. (a) True (b) False
26. 26.True or false: to use daylight to read wastes electricity. (a) False (b) True
27. 27.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
28. 28.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) use daylight to read (d) unplug idle chargers
29. 29.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) use daylight to read (d) unplug idle chargers
30. 30.🧾 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?
31. 31.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) use LED lamps
32. 32.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
33. 33.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
34. 34.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) switch off empty rooms (d) leave fridge door open
35. 35.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.True or false: to use daylight to read saves electricity. (a) True (b) False
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 8 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) unplug idle chargers

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