Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 241 · 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 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers
3. 3.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
4. 4.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
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 use daylight to read? (a) saves electricity (b) wastes electricity
7. 7.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
8. 8.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) switch off empty rooms (d) iron one shirt at a time
9. 9.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
11. 11.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
12. 12.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
13. 13.🧾 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
14. 14.🧾 A family uses 40 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
15. 15.True or false: to use daylight to read saves electricity. (a) True (b) False
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
17. 17.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
18. 18.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) use daylight to read (d) use old filament bulbs
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 2 hours. How many watt-hours (Wh) are saved?
20. 20.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
21. 21.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) switch off empty rooms
22. 22.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
23. 23.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
24. 24.Which of these wastes electricity? (a) use daylight to read (b) leave fridge door open (c) set the AC to 24 °C (d) use LED lamps
25. 25.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
26. 26.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) run fans in empty rooms (d) unplug idle chargers
28. 28.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
29. 29.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
31. 31.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (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 2 hours. How many watt-hours (Wh) are saved?
33. 33.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) use old filament bulbs
34. 34.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
35. 35.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
36. 36.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 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?
38. 38.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
39. 39.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use old filament bulbs (d) use LED lamps
40. 40.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) unplug idle chargers

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