Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 882 · 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 of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) iron one shirt at a time (d) leave fridge door open
2. 2.🧾 A family uses 30 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
4. 4.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
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 2 hours. How many watt-hours (Wh) are saved?
7. 7.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave the TV on standby (d) use daylight to read
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
9. 9.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) switch off empty rooms (d) iron one shirt at a time
10. 10.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) use LED lamps (d) iron one shirt at a time
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
14. 14.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
15. 15.🧾 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?
16. 16.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) use LED lamps
17. 17.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) switch off empty rooms
18. 18.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
19. 19.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) iron one shirt at a time (d) leave fridge door open
20. 20.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
21. 21.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
23. 23.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
24. 24.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) unplug idle chargers (d) use old filament bulbs
25. 25.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) run fans in empty rooms (d) set the AC to 24 °C
26. 26.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
27. 27.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
28. 28.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
30. 30.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
32. 32.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) leave fridge door open
33. 33.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
35. 35.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
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 5 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 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?
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) leave fridge door open (c) leave the TV on standby (d) set the AC to 24 °C
40. 40.🧾 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?

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