Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 22 · 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 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
2. 2.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
3. 3.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) use daylight to read (d) use LED lamps
4. 4.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
5. 5.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) iron one shirt at a time (d) use LED lamps
7. 7.🧾 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?
8. 8.True or false: to use daylight to read wastes electricity. (a) True (b) False
9. 9.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) use old filament bulbs (d) iron one shirt at a time
11. 11.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
13. 13.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) set the AC to 24 °C
14. 14.🧾 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?
15. 15.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) unplug idle chargers
16. 16.True or false: to leave fridge door open saves electricity. (a) True (b) False
17. 17.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
18. 18.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
19. 19.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
20. 20.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) close the fridge quickly (d) switch off empty rooms
21. 21.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 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?
23. 23.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
24. 24.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
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 8 hours. How many watt-hours (Wh) are saved?
26. 26.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
28. 28.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
29. 29.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
30. 30.🔍 Which is the odd one out? (a) close the fridge quickly (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time
31. 31.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
32. 32.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) use old filament bulbs
33. 33.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use LED lamps (d) use daylight to read
35. 35.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) use LED lamps (d) leave the TV on standby
36. 36.🧾 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?
37. 37.True or false: to use old filament bulbs saves electricity. (a) False (b) True
38. 38.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
39. 39.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) run fans in empty rooms (d) iron one shirt at a time
40. 40.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity

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