Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 798 · 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 family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
2. 2.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
3. 3.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
5. 5.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
6. 6.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
7. 7.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
8. 8.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) use LED lamps (d) run fans in empty rooms
9. 9.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
10. 10.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) switch off empty rooms (d) run fans in empty rooms
11. 11.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
12. 12.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
13. 13.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) set the AC to 24 °C (d) leave the TV on standby
14. 14.Which of these saves electricity? (a) leave fridge door open (b) use daylight to read (c) use old filament bulbs (d) leave the TV on standby
15. 15.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
16. 16.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
17. 17.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 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?
19. 19.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) use old filament bulbs
20. 20.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) leave fridge door open (d) use LED lamps
21. 21.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
22. 22.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 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?
24. 24.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
26. 26.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
27. 27.🧾 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?
28. 28.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use daylight to read (d) switch off empty rooms
29. 29.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
30. 30.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
31. 31.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) set the AC to 24 °C (d) run fans in empty rooms
34. 34.True or false: to use LED lamps saves electricity. (a) True (b) False
35. 35.True or false: to use daylight to read wastes electricity. (a) True (b) False
36. 36.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. 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) use old filament bulbs (d) switch off empty rooms
38. 38.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
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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