Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 786 · 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.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
3. 3.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) run fans in empty rooms (d) set the AC to 24 °C
4. 4.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
5. 5.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) leave the TV on standby (d) use old filament bulbs
7. 7.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
8. 8.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
10. 10.True or false: to unplug idle chargers saves electricity. (a) True (b) False
11. 11.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
13. 13.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) switch off empty rooms (d) use LED lamps
14. 14.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
15. 15.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
16. 16.True or false: to use daylight to read saves electricity. (a) True (b) False
17. 17.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use daylight to read (d) leave fridge door open
18. 18.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) leave the TV on standby (d) use old filament bulbs
19. 19.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) switch off empty rooms (d) leave the TV on standby
20. 20.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 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?
22. 22.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) use daylight to read
23. 23.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) switch off empty rooms (d) close the fridge quickly
24. 24.True or false: to leave the TV on standby saves electricity. (a) False (b) True
25. 25.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
26. 26.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
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 9 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) close the fridge quickly (d) run fans in empty rooms
30. 30.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
31. 31.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) close the fridge quickly
32. 32.True or false: to use old filament bulbs saves electricity. (a) True (b) False
33. 33.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
35. 35.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) leave the TV on standby (d) run fans in empty rooms
36. 36.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) iron one shirt at a time (d) leave the TV on standby
37. 37.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
39. 39.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 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) set the AC to 24 °C

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