Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 461 · 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 family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
2. 2.🧾 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
3. 3.True or false: to leave fridge door open wastes electricity. (a) True (b) False
4. 4.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
5. 5.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
7. 7.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) use LED lamps (d) leave fridge door open
8. 8.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
10. 10.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
12. 12.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) run fans in empty rooms (d) switch off empty rooms
13. 13.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
15. 15.🔍 Which is the odd one out? (a) leave the TV on standby (b) close the fridge quickly (c) use daylight to read (d) use LED lamps
16. 16.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) use daylight to read (d) leave fridge door open
17. 17.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
18. 18.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
21. 21.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) switch off empty rooms
22. 22.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) leave fridge door open (d) run fans in empty rooms
23. 23.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) use old filament bulbs
24. 24.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
26. 26.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
27. 27.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
29. 29.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) use daylight to read (d) switch off empty rooms
30. 30.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
31. 31.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
32. 32.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) leave fridge door open (d) leave the TV on standby
33. 33.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
37. 37.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
38. 38.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) use LED lamps (d) close the fridge quickly
40. 40.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs

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