Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 189 · 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 old filament bulbs? (a) saves electricity (b) wastes electricity
2. 2.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
3. 3.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) close the fridge quickly (d) use LED lamps
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
5. 5.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
6. 6.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) set the AC to 24 °C (d) close the fridge quickly
7. 7.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) use daylight to read (d) use LED lamps
8. 8.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
9. 9.🔍 Which is the odd one out? (a) iron one shirt at a time (b) close the fridge quickly (c) leave fridge door open (d) run fans in empty rooms
10. 10.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
11. 11.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
12. 12.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
13. 13.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
14. 14.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) iron one shirt at a time (d) leave fridge door open
15. 15.True or false: to use daylight to read wastes electricity. (a) True (b) False
16. 16.🧾 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?
17. 17.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
18. 18.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
19. 19.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
21. 21.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) set the AC to 24 °C (d) unplug idle chargers
22. 22.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) a candle (d) an oil lamp
23. 23.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
24. 24.True or false: to use daylight to read saves electricity. (a) True (b) False
25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) set the AC to 24 °C
26. 26.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) iron one shirt at a time (d) close the fridge quickly
28. 28.True or false: to use LED lamps wastes electricity. (a) True (b) False
29. 29.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) leave the TV on standby (d) use old filament bulbs
30. 30.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
31. 31.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
33. 33.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) iron one shirt at a time
34. 34.Which of these saves electricity? (a) switch off empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
36. 36.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) run fans in empty rooms (d) unplug idle chargers
39. 39.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
40. 40.True or false: to switch off empty rooms wastes electricity. (a) True (b) False

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