Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 540 · 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.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
2. 2.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
3. 3.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
4. 4.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
5. 5.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) set the AC to 24 °C (d) unplug idle chargers
7. 7.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) switch off empty rooms (d) close the fridge quickly
8. 8.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
9. 9.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
10. 10.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
11. 11.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
12. 12.🧾 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?
13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) leave the TV on standby
14. 14.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) set the AC to 24 °C
15. 15.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
16. 16.🧾 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?
17. 17.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
18. 18.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
20. 20.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
21. 21.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
22. 22.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
24. 24.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
25. 25.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) use daylight to read (d) run fans in empty rooms
26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
27. 27.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
28. 28.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
29. 29.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) iron one shirt at a time (d) leave the TV on standby
31. 31.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) use daylight to read (d) switch off empty rooms
32. 32.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
36. 36.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
37. 37.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
38. 38.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) switch off empty rooms (d) leave fridge door open
39. 39.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use daylight to read (d) iron one shirt at a time
40. 40.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?

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