Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 281 · 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.True or false: to leave the TV on standby saves electricity. (a) False (b) True
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
3. 3.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
4. 4.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
5. 5.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
7. 7.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) leave the TV on standby (d) run fans in empty rooms
8. 8.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms
9. 9.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
10. 10.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
11. 11.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
12. 12.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
13. 13.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
14. 14.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
15. 15.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
16. 16.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
17. 17.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
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 4 hours. How many watt-hours (Wh) are saved?
19. 19.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
21. 21.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) iron one shirt at a time (d) unplug idle chargers
22. 22.True or false: to unplug idle chargers saves electricity. (a) True (b) False
23. 23.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
24. 24.🧾 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?
25. 25.🧾 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?
26. 26.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) leave fridge door open (d) iron one shirt at a time
28. 28.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
31. 31.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) close the fridge quickly (d) leave fridge door open
32. 32.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
33. 33.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) use daylight to read (d) switch off empty rooms
34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) use daylight to read
35. 35.🧾 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?
36. 36.🧾 A family uses 110 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
37. 37.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.True or false: to switch off empty rooms saves electricity. (a) False (b) True
39. 39.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
40. 40.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) use LED lamps (d) unplug idle chargers

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