Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 252 · 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 set the AC to 24 °C wastes electricity. (a) False (b) True
2. 2.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
3. 3.True or false: to use daylight to read wastes electricity. (a) True (b) False
4. 4.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
5. 5.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use LED lamps (d) leave the TV on standby
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
7. 7.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
8. 8.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
9. 9.True or false: to leave the TV on standby saves electricity. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) use old filament bulbs (d) close the fridge quickly
11. 11.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
13. 13.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
14. 14.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) iron one shirt at a time (d) run fans in empty rooms
15. 15.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) use daylight to read (d) run fans in empty rooms
16. 16.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
17. 17.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
19. 19.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
20. 20.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
21. 21.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
22. 22.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
24. 24.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
25. 25.True or false: to switch off empty rooms saves electricity. (a) False (b) True
26. 26.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) set the AC to 24 °C
27. 27.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) iron one shirt at a time (d) use LED lamps
28. 28.Which of these saves electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
29. 29.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
30. 30.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) unplug idle chargers (d) use old filament bulbs
31. 31.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) switch off empty rooms (d) run fans in empty rooms
32. 32.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
33. 33.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) use daylight to read (d) leave fridge door open
34. 34.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 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?
37. 37.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
38. 38.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
39. 39.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 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?

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