Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 979 · 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.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
2. 2.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
3. 3.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) use LED lamps (d) leave fridge door open
5. 5.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
6. 6.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
7. 7.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
8. 8.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) unplug idle chargers
9. 9.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) run fans in empty rooms (d) switch off empty rooms
10. 10.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
13. 13.🧾 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?
14. 14.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) use daylight to read (d) leave the TV on standby
16. 16.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. 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 3 hours. How many watt-hours (Wh) are saved?
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 8 hours. How many watt-hours (Wh) are saved?
19. 19.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
20. 20.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
21. 21.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) leave the TV on standby (d) switch off empty rooms
22. 22.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
25. 25.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) run fans in empty rooms (d) use LED lamps
26. 26.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
27. 27.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to use daylight to read saves electricity. (a) False (b) True
29. 29.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
30. 30.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
31. 31.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
33. 33.True or false: to switch off empty rooms saves electricity. (a) True (b) False
34. 34.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use daylight to read (d) leave fridge door open
35. 35.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) run fans in empty rooms (d) leave the TV on standby
36. 36.🧾 A 50 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) use daylight to read (c) set the AC to 24 °C (d) leave the TV on standby
38. 38.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) use old filament bulbs
39. 39.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 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?

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