Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 625 · 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) set the AC to 24 °C (b) use daylight to read (c) leave fridge door open (d) close the fridge quickly
2. 2.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
3. 3.🧾 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?
4. 4.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) leave fridge door open (d) switch off empty rooms
5. 5.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms
6. 6.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
7. 7.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) leave the TV on standby (d) iron one shirt at a time
8. 8.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
9. 9.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to leave the TV on standby saves electricity. (a) False (b) True
11. 11.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
12. 12.True or false: to leave fridge door open saves electricity. (a) True (b) False
13. 13.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
15. 15.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
16. 16.🧾 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?
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
18. 18.True or false: to switch off empty rooms saves electricity. (a) False (b) True
19. 19.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
20. 20.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) switch off empty rooms (d) use daylight to read
21. 21.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) use old filament bulbs (d) unplug idle chargers
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use old filament bulbs (d) leave the TV on standby
23. 23.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
24. 24.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
25. 25.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
26. 26.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
27. 27.🧾 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?
28. 28.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
29. 29.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) leave the TV on standby (d) use LED lamps
30. 30.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
31. 31.True or false: to use daylight to read saves electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
33. 33.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
34. 34.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
35. 35.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
36. 36.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.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
38. 38.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
39. 39.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

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