Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 131 · 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.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
2. 2.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) close the fridge quickly (d) use old filament bulbs
3. 3.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) unplug idle chargers
4. 4.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) switch off empty rooms (d) use old filament bulbs
5. 5.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
6. 6.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
7. 7.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
8. 8.True or false: to unplug idle chargers saves electricity. (a) True (b) False
9. 9.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
11. 11.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
12. 12.🧾 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?
13. 13.🧾 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?
14. 14.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
15. 15.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
16. 16.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) run fans in empty rooms (d) unplug idle chargers
17. 17.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) use LED lamps (d) use daylight to read
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
19. 19.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) use LED lamps (d) leave fridge door open
20. 20.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
21. 21.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) use LED lamps (d) leave the TV on standby
22. 22.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
23. 23.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
24. 24.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
25. 25.🧾 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?
26. 26.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
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 7 hours. How many watt-hours (Wh) are saved?
28. 28.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
29. 29.True or false: to use daylight to read saves electricity. (a) False (b) True
30. 30.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
31. 31.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
32. 32.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
33. 33.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (d) set the AC to 24 °C
35. 35.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
36. 36.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
37. 37.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) unplug idle chargers (d) leave fridge door open
38. 38.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) use LED lamps
39. 39.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) close the fridge quickly (d) iron one shirt at a time
40. 40.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) run fans in empty rooms (d) iron one shirt at a time

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