Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 613 · 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) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
2. 2.Which of these wastes electricity? (a) set the AC to 24 °C (b) run fans in empty rooms (c) use daylight to read (d) close the fridge quickly
3. 3.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
4. 4.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
5. 5.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) run fans in empty rooms (d) unplug idle chargers
6. 6.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
7. 7.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
8. 8.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
10. 10.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) use daylight to read (d) leave the TV on standby
11. 11.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
14. 14.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
15. 15.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) use daylight to read
16. 16.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
17. 17.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
18. 18.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
21. 21.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) use LED lamps (d) unplug idle chargers
22. 22.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
23. 23.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
24. 24.True or false: to leave fridge door open wastes electricity. (a) False (b) True
25. 25.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
26. 26.True or false: to use old filament bulbs saves electricity. (a) False (b) True
27. 27.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) use old filament bulbs (d) leave fridge door open
28. 28.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
29. 29.🧾 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?
30. 30.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to leave the TV on standby saves electricity. (a) False (b) True
32. 32.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) unplug idle chargers (d) use old filament bulbs
33. 33.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) unplug idle chargers
34. 34.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) leave the TV on standby (d) close the fridge quickly
36. 36.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to unplug idle chargers saves electricity. (a) True (b) False
38. 38.True or false: to switch off empty rooms saves electricity. (a) False (b) True
39. 39.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms

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