Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 329 · 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 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
2. 2.Which of these wastes electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) switch off empty rooms (d) set the AC to 24 °C
3. 3.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
4. 4.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
5. 5.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
6. 6.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
7. 7.True or false: to close the fridge quickly saves electricity. (a) True (b) False
8. 8.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
9. 9.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
10. 10.Which of these wastes electricity? (a) close the fridge quickly (b) use old filament bulbs (c) use LED lamps (d) switch off empty rooms
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
12. 12.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) leave the TV on standby (d) unplug idle chargers
13. 13.True or false: to use old filament bulbs saves electricity. (a) True (b) False
14. 14.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) switch off empty rooms (d) leave the TV on standby
15. 15.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
16. 16.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
17. 17.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
18. 18.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
19. 19.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
20. 20.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
21. 21.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) unplug idle chargers (d) use old filament bulbs
22. 22.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
24. 24.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
25. 25.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) use old filament bulbs (d) unplug idle chargers
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
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 6 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) use LED lamps (d) close the fridge quickly
30. 30.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
31. 31.🧾 A family uses 60 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
33. 33.🧾 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?
34. 34.🧾 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
35. 35.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) leave fridge door open (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.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) iron one shirt at a time
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 5 hours. How many watt-hours (Wh) are saved?
39. 39.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) use daylight to read (d) run fans in empty rooms

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