Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 326 · 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 6 hours. How many units (kWh) of electricity does it use? =
2. 2.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
3. 3.Which of these saves electricity? (a) leave fridge door open (b) close the fridge quickly (c) run fans in empty rooms (d) use old filament bulbs
4. 4.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
5. 5.🧾 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
6. 6.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) switch off empty rooms (d) use old filament bulbs
7. 7.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
10. 10.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) set the AC to 24 °C (d) use daylight to read
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
12. 12.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
13. 13.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) switch off empty rooms (d) use old filament bulbs
14. 14.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
15. 15.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use old filament bulbs (d) leave fridge door open
17. 17.🧾 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?
18. 18.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) use daylight to read
19. 19.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
20. 20.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
21. 21.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
22. 22.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) set the AC to 24 °C (d) close the fridge quickly
23. 23.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
25. 25.🧾 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?
26. 26.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
27. 27.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
28. 28.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
29. 29.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave fridge door open (d) use daylight to read
30. 30.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
32. 32.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) run fans in empty rooms (d) switch off empty rooms
33. 33.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
34. 34.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
38. 38.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
39. 39.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) use LED lamps (d) unplug idle chargers
40. 40.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True

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