Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 471 · 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.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) leave fridge door open
3. 3.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
5. 5.True or false: to use LED lamps wastes electricity. (a) False (b) True
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
7. 7.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
8. 8.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) use old filament bulbs
9. 9.🧾 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?
10. 10.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
11. 11.🧾 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?
12. 12.Which of these wastes electricity? (a) unplug idle chargers (b) iron one shirt at a time (c) use daylight to read (d) use LED lamps
13. 13.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) unplug idle chargers (d) run fans in empty rooms
14. 14.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
15. 15.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
17. 17.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) close the fridge quickly
18. 18.💡 Does it save or waste electricity to run fans in empty rooms? (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 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.True or false: to use daylight to read saves electricity. (a) False (b) True
22. 22.True or false: to unplug idle chargers saves electricity. (a) False (b) True
23. 23.🧾 A 2000 W appliance runs for 6 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 ₹4. What is the bill (in ₹)?
25. 25.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
26. 26.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
27. 27.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) iron one shirt at a time (d) use old filament bulbs
28. 28.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
29. 29.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) use daylight to read (d) run fans in empty rooms
30. 30.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
31. 31.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
32. 32.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
33. 33.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
35. 35.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
36. 36.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) use old filament bulbs (d) set the AC to 24 °C
37. 37.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
38. 38.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) use daylight to read
39. 39.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
40. 40.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity

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