Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 23 · 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 iron one shirt at a time? (a) saves electricity (b) wastes electricity
2. 2.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
3. 3.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
4. 4.Which of these wastes electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) close the fridge quickly
5. 5.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
6. 6.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
7. 7.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
9. 9.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
10. 10.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
12. 12.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
13. 13.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
14. 14.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
15. 15.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) close the fridge quickly (d) iron one shirt at a time
17. 17.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) run fans in empty rooms (d) iron one shirt at a time
18. 18.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) leave fridge door open
19. 19.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
20. 20.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
21. 21.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
22. 22.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
23. 23.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
24. 24.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
25. 25.True or false: to switch off empty rooms saves electricity. (a) False (b) True
26. 26.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
29. 29.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) close the fridge quickly
31. 31.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
32. 32.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use old filament bulbs (d) leave fridge door open
33. 33.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) close the fridge quickly (d) set the AC to 24 °C
34. 34.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
35. 35.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) switch off empty rooms (d) use daylight to read
39. 39.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
40. 40.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?

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