Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 680 · 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 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
2. 2.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) set the AC to 24 °C (d) run fans in empty rooms
3. 3.🧾 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?
4. 4.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
5. 5.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
6. 6.True or false: to close the fridge quickly saves electricity. (a) True (b) False
7. 7.🧾 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?
8. 8.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
9. 9.True or false: to use LED lamps saves electricity. (a) False (b) True
10. 10.True or false: to use LED lamps wastes electricity. (a) True (b) False
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 5 hours. How many watt-hours (Wh) are saved?
12. 12.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
13. 13.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
14. 14.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
16. 16.🧾 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?
17. 17.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
18. 18.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
19. 19.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) use daylight to read (d) leave the TV on standby
20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
21. 21.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
22. 22.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
23. 23.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) use LED lamps
24. 24.True or false: to use daylight to read saves electricity. (a) True (b) False
25. 25.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) switch off empty rooms (d) use LED lamps
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 lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
28. 28.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use daylight to read (d) run fans in empty rooms
30. 30.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
31. 31.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
33. 33.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
34. 34.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) use LED lamps (d) unplug idle chargers
35. 35.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
36. 36.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
37. 37.True or false: to use old filament bulbs saves electricity. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
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 8 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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