Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 707 · 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 of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
2. 2.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
3. 3.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
4. 4.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) run fans in empty rooms (d) leave the TV on standby
6. 6.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
7. 7.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) leave fridge door open (d) unplug idle chargers
9. 9.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
10. 10.Which of these wastes electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) set the AC to 24 °C (d) use daylight to read
11. 11.True or false: to leave fridge door open saves electricity. (a) True (b) False
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 9 hours. How many watt-hours (Wh) are saved?
13. 13.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
15. 15.True or false: to leave the TV on standby saves electricity. (a) True (b) False
16. 16.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
17. 17.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use LED lamps (d) run fans in empty rooms
18. 18.True or false: to leave fridge door open wastes electricity. (a) False (b) True
19. 19.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
20. 20.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
21. 21.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) use old filament bulbs (d) close the fridge quickly
22. 22.True or false: to close the fridge quickly saves electricity. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use daylight to read (d) run fans in empty rooms
24. 24.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) set the AC to 24 °C
25. 25.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
26. 26.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
27. 27.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
28. 28.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
32. 32.True or false: to use daylight to read saves electricity. (a) True (b) False
33. 33.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
34. 34.True or false: to run fans in empty rooms 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 1 hour. How many watt-hours (Wh) are saved?
36. 36.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
37. 37.🧾 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?
38. 38.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
40. 40.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt

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