Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 259 · 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 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
3. 3.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) leave fridge door open (d) use LED lamps
4. 4.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) leave fridge door open
5. 5.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
6. 6.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) run fans in empty rooms (d) switch off empty rooms
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
8. 8.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
9. 9.🧾 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?
10. 10.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
12. 12.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
13. 13.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
14. 14.🧾 A family uses 100 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
16. 16.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
17. 17.🧾 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?
18. 18.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
19. 19.True or false: to leave the TV on standby saves electricity. (a) True (b) False
20. 20.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
21. 21.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
22. 22.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
23. 23.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
24. 24.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
26. 26.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
27. 27.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use LED lamps (d) close the fridge quickly
28. 28.Which of these saves electricity? (a) use daylight to read (b) run fans in empty rooms (c) use old filament bulbs (d) leave the TV on standby
29. 29.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) iron one shirt at a time (d) run fans in empty rooms
31. 31.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
32. 32.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
35. 35.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
36. 36.True or false: to leave fridge door open wastes electricity. (a) False (b) True
37. 37.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
38. 38.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
39. 39.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) switch off empty rooms (d) unplug idle chargers
40. 40.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

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