Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 896 · 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.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) run fans in empty rooms (d) use daylight to read
2. 2.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
3. 3.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
4. 4.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) iron one shirt at a time (d) leave the TV on standby
5. 5.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) leave fridge door open
6. 6.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) set the AC to 24 °C (d) use daylight to read
7. 7.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
9. 9.True or false: to unplug idle chargers saves electricity. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) close the fridge quickly
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
12. 12.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
13. 13.True or false: to switch off empty rooms saves electricity. (a) False (b) True
14. 14.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
15. 15.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) use old filament bulbs
16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
17. 17.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
18. 18.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
19. 19.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) use LED lamps (d) close the fridge quickly
20. 20.🧾 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?
21. 21.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
22. 22.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
23. 23.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A family uses 30 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
25. 25.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
26. 26.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) use daylight to read (d) use old filament bulbs
27. 27.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
29. 29.True or false: to use LED lamps wastes electricity. (a) False (b) True
30. 30.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
34. 34.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave fridge door open (d) use daylight to read
35. 35.🧾 A 40 W filament bulb is swapped for a 6 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 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?
37. 37.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
39. 39.Which of these saves electricity? (a) iron one shirt at a time (b) use LED lamps (c) run fans in empty rooms (d) leave fridge door open
40. 40.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

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