Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 60 · 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.🧾 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?
2. 2.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
3. 3.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
4. 4.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
5. 5.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
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 1 hour. How many watt-hours (Wh) are saved?
7. 7.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
10. 10.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
11. 11.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
13. 13.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
15. 15.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) use daylight to read (d) switch off empty rooms
16. 16.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 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?
18. 18.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
19. 19.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
20. 20.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
21. 21.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
22. 22.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) unplug idle chargers (d) use daylight to read
23. 23.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
24. 24.True or false: to use LED lamps wastes electricity. (a) True (b) False
25. 25.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) use daylight to read
28. 28.True or false: to leave fridge door open wastes electricity. (a) True (b) False
29. 29.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
30. 30.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) use LED lamps (d) run fans in empty rooms
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 1 hour. How many watt-hours (Wh) are saved?
32. 32.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
33. 33.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) use daylight to read (d) leave fridge door open
34. 34.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
36. 36.True or false: to leave fridge door open saves electricity. (a) True (b) False
37. 37.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) unplug idle chargers (d) run fans in empty rooms
38. 38.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
39. 39.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
40. 40.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) leave the TV on standby (d) close the fridge quickly

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