Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 567 · 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.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
2. 2.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) close the fridge quickly (d) leave the TV on standby
3. 3.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
4. 4.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
5. 5.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) close the fridge quickly (d) leave fridge door open
6. 6.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
9. 9.True or false: to leave the TV on standby saves electricity. (a) False (b) True
10. 10.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
11. 11.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
12. 12.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
13. 13.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) use old filament bulbs (d) run fans in empty rooms
14. 14.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
15. 15.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) use old filament bulbs
16. 16.Which of these saves electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) leave the TV on standby (d) leave fridge door open
17. 17.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) run fans in empty rooms (d) iron one shirt at a time
20. 20.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) switch off empty rooms (d) use LED lamps
21. 21.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) use LED lamps (d) set the AC to 24 °C
23. 23.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
24. 24.🧾 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?
25. 25.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
26. 26.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) switch off empty rooms (d) use daylight to read
27. 27.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use daylight to read (d) leave fridge door open
29. 29.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
30. 30.True or false: to unplug idle chargers saves electricity. (a) True (b) False
31. 31.🧾 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?
32. 32.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) switch off empty rooms (d) iron one shirt at a time
33. 33.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
34. 34.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
35. 35.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) leave the TV on standby (d) use daylight to read
37. 37.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) unplug idle chargers (d) leave fridge door open

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