Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 495 · 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.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
3. 3.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
4. 4.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
6. 6.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) unplug idle chargers (d) leave fridge door open
7. 7.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
9. 9.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) close the fridge quickly (d) switch off empty rooms
10. 10.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
12. 12.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
13. 13.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
14. 14.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) set the AC to 24 °C (d) leave the TV on standby
15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) close the fridge quickly
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 3 hours. How many watt-hours (Wh) are saved?
17. 17.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) leave fridge door open (d) iron one shirt at a time
18. 18.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) leave fridge door open (d) set the AC to 24 °C
19. 19.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) use LED lamps
20. 20.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
21. 21.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 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
23. 23.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
24. 24.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
25. 25.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
27. 27.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
28. 28.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
29. 29.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 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?
31. 31.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
32. 32.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) use old filament bulbs
33. 33.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) iron one shirt at a time (d) unplug idle chargers
34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) switch off empty rooms (d) use daylight to read
35. 35.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) use LED lamps
36. 36.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) unplug idle chargers (d) use daylight to read
37. 37.True or false: to unplug idle chargers saves electricity. (a) False (b) True
38. 38.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
39. 39.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
40. 40.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

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