Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 686 · 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 use LED lamps? (a) saves electricity (b) wastes electricity
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
3. 3.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
4. 4.True or false: to leave fridge door open wastes electricity. (a) False (b) True
5. 5.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
6. 6.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
7. 7.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) unplug idle chargers (d) leave fridge door open
8. 8.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
9. 9.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
11. 11.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) close the fridge quickly (d) run fans in empty rooms
12. 12.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
13. 13.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) switch off empty rooms (d) leave the TV on standby
14. 14.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) switch off empty rooms (d) use daylight to read
15. 15.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
17. 17.True or false: to switch off empty rooms saves electricity. (a) True (b) False
18. 18.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
19. 19.🧾 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?
20. 20.True or false: to use daylight to read wastes electricity. (a) False (b) True
21. 21.True or false: to leave fridge door open saves electricity. (a) True (b) False
22. 22.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) leave the TV on standby (d) use old filament bulbs
24. 24.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) use daylight to read (d) use LED lamps
26. 26.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) switch off empty rooms
28. 28.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
29. 29.🧾 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?
30. 30.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) close the fridge quickly (d) use old filament bulbs
31. 31.True or false: to use LED lamps wastes electricity. (a) True (b) False
32. 32.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
34. 34.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
35. 35.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
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 8 hours. How many watt-hours (Wh) are saved?
37. 37.True or false: to unplug idle chargers saves electricity. (a) True (b) False
38. 38.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
39. 39.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
40. 40.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True

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