Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 977 · 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) close the fridge quickly (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
2. 2.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) leave fridge door open (d) run fans in empty rooms
3. 3.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
5. 5.True or false: to unplug idle chargers saves electricity. (a) True (b) False
6. 6.True or false: to leave fridge door open saves electricity. (a) False (b) True
7. 7.True or false: to use LED lamps saves electricity. (a) True (b) False
8. 8.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) a candle (d) an oil lamp
9. 9.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
10. 10.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) leave fridge door open (d) run fans in empty rooms
11. 11.True or false: to leave the TV on standby saves electricity. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) switch off empty rooms (d) use LED lamps
13. 13.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) set the AC to 24 °C
15. 15.🧾 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?
16. 16.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
18. 18.🔍 Which is the odd one out? (a) switch off empty rooms (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
19. 19.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
20. 20.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
22. 22.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
23. 23.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) close the fridge quickly (d) leave the TV on standby
24. 24.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
25. 25.True or false: to switch off empty rooms saves electricity. (a) False (b) True
26. 26.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
27. 27.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
28. 28.🧾 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?
29. 29.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) use daylight to read (d) leave fridge door open
31. 31.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) switch off empty rooms (d) use daylight to read
32. 32.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) switch off empty rooms (d) use old filament bulbs
33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
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 run fans in empty rooms saves electricity. (a) True (b) False
37. 37.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) use daylight to read
38. 38.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
39. 39.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) set the AC to 24 °C (d) use LED lamps
40. 40.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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