Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 902 · 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.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
2. 2.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
3. 3.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) unplug idle chargers (d) use daylight to read
4. 4.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
5. 5.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) use LED lamps (d) leave the TV on standby
6. 6.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
7. 7.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) unplug idle chargers (d) use daylight to read
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
10. 10.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
12. 12.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
14. 14.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) switch off empty rooms (d) use old filament bulbs
15. 15.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) use daylight to read (d) use old filament bulbs
16. 16.True or false: to close the fridge quickly saves electricity. (a) True (b) False
17. 17.True or false: to switch off empty rooms saves electricity. (a) True (b) False
18. 18.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
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 5 hours. How many watt-hours (Wh) are saved?
20. 20.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
21. 21.True or false: to unplug idle chargers saves electricity. (a) True (b) False
22. 22.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) switch off empty rooms
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 4 hours. How many watt-hours (Wh) are saved?
24. 24.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
25. 25.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
26. 26.🧾 A family uses 150 units of electricity in a month and each unit costs ₹7. 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 6 hours. How many watt-hours (Wh) are saved?
28. 28.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) close the fridge quickly (d) leave the TV on standby
29. 29.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
30. 30.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
31. 31.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) set the AC to 24 °C (d) use LED lamps
32. 32.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
33. 33.True or false: to leave fridge door open wastes electricity. (a) False (b) True
34. 34.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
38. 38.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
39. 39.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) unplug idle chargers (d) run fans in empty rooms
40. 40.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?

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