Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 675 · 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.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
3. 3.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
5. 5.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) run fans in empty rooms (d) close the fridge quickly
6. 6.True or false: to use LED lamps wastes electricity. (a) False (b) True
7. 7.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
10. 10.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
11. 11.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) unplug idle chargers (d) switch off empty rooms
12. 12.Which of these wastes electricity? (a) use daylight to read (b) leave the TV on standby (c) set the AC to 24 °C (d) switch off empty rooms
13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) leave fridge door open
14. 14.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
15. 15.True or false: to use daylight to read saves electricity. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) iron one shirt at a time (d) set the AC to 24 °C
17. 17.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
18. 18.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
19. 19.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
20. 20.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
21. 21.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
22. 22.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
23. 23.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
24. 24.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) leave the TV on standby (d) close the fridge quickly
25. 25.True or false: to leave the TV on standby saves electricity. (a) False (b) True
26. 26.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
27. 27.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
29. 29.True or false: to leave fridge door open saves electricity. (a) False (b) True
30. 30.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
32. 32.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) use daylight to read
33. 33.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
35. 35.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
36. 36.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
37. 37.True or false: to leave fridge door open wastes electricity. (a) False (b) True
38. 38.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.Which of these saves electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) use old filament bulbs (d) run fans in empty rooms
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 1 hour. How many watt-hours (Wh) are saved?

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