Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 104 · 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.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
2. 2.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) run fans in empty rooms (d) use old filament bulbs
3. 3.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
4. 4.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
5. 5.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
7. 7.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
8. 8.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
11. 11.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
13. 13.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
14. 14.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
15. 15.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
16. 16.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
17. 17.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
18. 18.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.True or false: to use LED lamps saves electricity. (a) True (b) False
20. 20.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) iron one shirt at a time (d) close the fridge quickly
21. 21.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) use LED lamps (d) unplug idle chargers
23. 23.True or false: to use old filament bulbs saves electricity. (a) True (b) False
24. 24.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
25. 25.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
26. 26.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) leave fridge door open (d) use daylight to read
28. 28.🧾 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?
29. 29.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) unplug idle chargers (d) switch off empty rooms
31. 31.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) use LED lamps
33. 33.True or false: to leave fridge door open wastes electricity. (a) False (b) True
34. 34.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
38. 38.True or false: to unplug idle chargers saves electricity. (a) False (b) True
39. 39.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
40. 40.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

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