Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 257 · 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.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
2. 2.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
3. 3.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
5. 5.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) switch off empty rooms (d) leave fridge door open
6. 6.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
7. 7.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) switch off empty rooms (d) unplug idle chargers
8. 8.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
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) leave the TV on standby (b) close the fridge quickly (c) iron one shirt at a time (d) use old filament bulbs
11. 11.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) use old filament bulbs (d) leave the TV on standby
12. 12.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
13. 13.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) use old filament bulbs
15. 15.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) run fans in empty rooms (d) iron one shirt at a time
16. 16.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
17. 17.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) use old filament bulbs
18. 18.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) unplug idle chargers (d) use LED lamps
19. 19.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
20. 20.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) leave the TV on standby (d) leave fridge door open
21. 21.True or false: to switch off empty rooms saves electricity. (a) False (b) True
22. 22.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
23. 23.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
24. 24.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use old filament bulbs (d) use daylight to read
25. 25.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) use daylight to read (d) use LED lamps
27. 27.🧾 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?
28. 28.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
29. 29.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) leave fridge door open (d) use daylight to read
30. 30.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
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 5 hours. How many watt-hours (Wh) are saved?
32. 32.True or false: to use LED lamps saves electricity. (a) True (b) False
33. 33.True or false: to leave fridge door open saves electricity. (a) False (b) True
34. 34.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
35. 35.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) leave the TV on standby (d) unplug idle chargers
36. 36.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
39. 39.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to unplug idle chargers wastes electricity. (a) True (b) False

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