Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 118 · 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 is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) unplug idle chargers
2. 2.True or false: to use LED lamps wastes electricity. (a) False (b) True
3. 3.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
5. 5.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) set the AC to 24 °C (d) run fans in empty rooms
6. 6.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
8. 8.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
10. 10.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
11. 11.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) set the AC to 24 °C (d) use LED lamps
12. 12.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) use daylight to read
13. 13.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
14. 14.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
15. 15.True or false: to leave fridge door open saves electricity. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) close the fridge quickly (d) run fans in empty rooms
17. 17.🧾 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?
18. 18.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
19. 19.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
20. 20.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use LED lamps (d) run fans in empty rooms
21. 21.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
22. 22.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
23. 23.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) unplug idle chargers (d) switch off empty rooms
24. 24.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
26. 26.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) use daylight to read (d) use LED lamps
27. 27.🧾 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?
28. 28.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) switch off empty rooms (d) run fans in empty rooms
29. 29.🧾 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?
30. 30.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) run fans in empty rooms (d) iron one shirt at a time
31. 31.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
32. 32.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
33. 33.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
35. 35.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
36. 36.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
37. 37.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
38. 38.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
39. 39.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) unplug idle chargers
40. 40.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) close the fridge quickly (d) use daylight to read

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