Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 373 · 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 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
2. 2.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) unplug idle chargers (d) iron one shirt at a time
3. 3.🧾 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
4. 4.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use old filament bulbs (d) run fans in empty rooms
5. 5.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 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?
7. 7.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) unplug idle chargers
9. 9.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) leave the TV on standby (d) close the fridge quickly
10. 10.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) unplug idle chargers (d) run fans in empty rooms
11. 11.True or false: to leave the TV on standby saves electricity. (a) True (b) False
12. 12.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
13. 13.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) run fans in empty rooms (d) set the AC to 24 °C
14. 14.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) switch off empty rooms (d) leave fridge door open
15. 15.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.True or false: to use daylight to read wastes electricity. (a) False (b) True
17. 17.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
18. 18.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) use daylight to read
19. 19.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
21. 21.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
23. 23.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) leave fridge door open (d) switch off empty rooms
24. 24.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
25. 25.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
27. 27.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
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 1 hour. How many watt-hours (Wh) are saved?
29. 29.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
30. 30.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
31. 31.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
32. 32.True or false: to use LED lamps wastes electricity. (a) True (b) False
33. 33.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
35. 35.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) leave fridge door open (d) run fans in empty rooms
37. 37.Which of these wastes electricity? (a) leave the TV on standby (b) use LED lamps (c) switch off empty rooms (d) close the fridge quickly
38. 38.True or false: to unplug idle chargers saves electricity. (a) False (b) True
39. 39.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) leave fridge door open (d) use LED lamps
40. 40.🧾 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?

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