Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 246 · 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 wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) run fans in empty rooms (d) close the fridge quickly
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
3. 3.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
4. 4.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) unplug idle chargers (d) switch off empty rooms
5. 5.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
6. 6.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
7. 7.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) set the AC to 24 °C (d) switch off empty rooms
8. 8.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
9. 9.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
10. 10.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) use LED lamps
11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
12. 12.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) use daylight to read (d) run fans in empty rooms
13. 13.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) switch off empty rooms
16. 16.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
17. 17.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
18. 18.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) use daylight to read (d) switch off empty rooms
19. 19.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
20. 20.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) run fans in empty rooms (d) leave the TV on standby
21. 21.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) iron one shirt at a time (d) run fans in empty rooms
23. 23.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) leave fridge door open (d) close the fridge quickly
24. 24.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) leave the TV on standby (d) run fans in empty rooms
25. 25.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
26. 26.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
28. 28.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
29. 29.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) leave the TV on standby
31. 31.True or false: to use LED lamps saves electricity. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) run fans in empty rooms (d) leave fridge door open
33. 33.True or false: to switch off empty rooms saves electricity. (a) False (b) True
34. 34.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
35. 35.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) use LED lamps (d) iron one shirt at a time
36. 36.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
39. 39.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
40. 40.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity

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