Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 519 · 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 unplug idle chargers? (a) saves electricity (b) wastes electricity
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
3. 3.🧾 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?
4. 4.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) use LED lamps (d) switch off empty rooms
5. 5.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
6. 6.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
7. 7.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
8. 8.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
9. 9.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
10. 10.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) close the fridge quickly
11. 11.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
14. 14.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
15. 15.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
16. 16.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
17. 17.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
18. 18.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
19. 19.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
20. 20.True or false: to close the fridge quickly saves electricity. (a) False (b) True
21. 21.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) use LED lamps (d) use old filament bulbs
22. 22.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
24. 24.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) close the fridge quickly (d) set the AC to 24 °C
25. 25.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
26. 26.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
27. 27.True or false: to use daylight to read saves electricity. (a) True (b) False
28. 28.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
29. 29.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) leave fridge door open
30. 30.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) run fans in empty rooms (d) use old filament bulbs
31. 31.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.Which of these wastes electricity? (a) leave fridge door open (b) use daylight to read (c) unplug idle chargers (d) use LED lamps
34. 34.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) switch off empty rooms
35. 35.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) use old filament bulbs (d) iron one shirt at a time
36. 36.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
38. 38.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
39. 39.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use old filament bulbs (d) switch off empty rooms
40. 40.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) iron one shirt at a time (d) use old filament bulbs

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