Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 532 · 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) wastes electricity (b) saves electricity
2. 2.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
3. 3.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
4. 4.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
5. 5.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
6. 6.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
7. 7.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
8. 8.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) leave fridge door open (d) set the AC to 24 °C
9. 9.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
10. 10.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) run fans in empty rooms (d) use old filament bulbs
11. 11.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) switch off empty rooms (d) run fans in empty rooms
12. 12.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
13. 13.🧾 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?
14. 14.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) switch off empty rooms (d) iron one shirt at a time
15. 15.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) close the fridge quickly (d) run fans in empty rooms
16. 16.True or false: to leave fridge door open wastes electricity. (a) False (b) True
17. 17.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) set the AC to 24 °C
18. 18.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
19. 19.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) use daylight to read (d) close the fridge quickly
20. 20.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
21. 21.True or false: to use daylight to read wastes electricity. (a) False (b) True
22. 22.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
23. 23.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
24. 24.Which of these wastes electricity? (a) leave fridge door open (b) use LED lamps (c) use daylight to read (d) set the AC to 24 °C
25. 25.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
27. 27.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
28. 28.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
30. 30.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) leave fridge door open (d) run fans in empty rooms
34. 34.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) close the fridge quickly
35. 35.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
36. 36.True or false: to use daylight to read saves electricity. (a) True (b) False
37. 37.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
38. 38.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
40. 40.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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