Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 291 · 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 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 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?
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
4. 4.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
5. 5.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
7. 7.🧾 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?
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
9. 9.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
10. 10.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
12. 12.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) use LED lamps (d) use old filament bulbs
13. 13.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) use daylight to read
16. 16.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
17. 17.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
18. 18.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) run fans in empty rooms
19. 19.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) use LED lamps (d) leave fridge door open
20. 20.True or false: to use LED lamps wastes electricity. (a) False (b) True
21. 21.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
22. 22.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
24. 24.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) iron one shirt at a time (d) leave fridge door open
25. 25.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) use LED lamps
27. 27.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
29. 29.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
30. 30.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
31. 31.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) switch off empty rooms (d) run fans in empty rooms
32. 32.🧾 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?
33. 33.True or false: to use LED lamps saves electricity. (a) False (b) True
34. 34.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) iron one shirt at a time (d) close the fridge quickly
36. 36.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
37. 37.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) close the fridge quickly (d) leave fridge door open
38. 38.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
40. 40.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity

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