Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 895 · 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 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?
2. 2.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
3. 3.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
5. 5.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
6. 6.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
8. 8.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) switch off empty rooms (d) use LED lamps
9. 9.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) close the fridge quickly (d) iron one shirt at a time
10. 10.🧾 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?
11. 11.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) set the AC to 24 °C
12. 12.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) leave fridge door open
13. 13.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) use old filament bulbs
14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) use old filament bulbs
15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave fridge door open (d) unplug idle chargers
16. 16.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) switch off empty rooms (d) close the fridge quickly
17. 17.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
18. 18.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
19. 19.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
22. 22.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
23. 23.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
26. 26.True or false: to use daylight to read wastes electricity. (a) True (b) False
27. 27.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
29. 29.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
30. 30.🧾 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?
31. 31.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) close the fridge quickly (d) iron one shirt at a time
32. 32.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
34. 34.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) set the AC to 24 °C (d) leave fridge door open
35. 35.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) use old filament bulbs (d) run fans in empty rooms
36. 36.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
37. 37.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) use LED lamps (d) use daylight to read
38. 38.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
39. 39.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?

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