Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 179 · 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 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) iron one shirt at a time
3. 3.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
4. 4.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) unplug idle chargers (d) use LED lamps
5. 5.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
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.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) leave the TV on standby (d) use old filament bulbs
9. 9.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) use old filament bulbs (d) leave the TV on standby
10. 10.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
13. 13.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) leave fridge door open (d) set the AC to 24 °C
14. 14.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
15. 15.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) use daylight to read (d) unplug idle chargers
16. 16.Which of these saves electricity? (a) switch off empty rooms (b) leave fridge door open (c) run fans in empty rooms (d) iron one shirt at a time
17. 17.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
18. 18.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) use daylight to read (d) switch off empty rooms
19. 19.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) unplug idle chargers
20. 20.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
21. 21.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
22. 22.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
23. 23.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
24. 24.Which of these saves electricity? (a) use daylight to read (b) iron one shirt at a time (c) leave the TV on standby (d) leave fridge door open
25. 25.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
27. 27.True or false: to use LED lamps saves electricity. (a) False (b) True
28. 28.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 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?
30. 30.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
31. 31.True or false: to leave fridge door open saves electricity. (a) True (b) False
32. 32.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
33. 33.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 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?
36. 36.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
37. 37.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
38. 38.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
39. 39.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
40. 40.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) close the fridge quickly

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