Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 885 · 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 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
2. 2.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
3. 3.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
4. 4.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
5. 5.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
6. 6.True or false: to close the fridge quickly saves electricity. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) use old filament bulbs
8. 8.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
9. 9.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
10. 10.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) switch off empty rooms (d) run fans in empty rooms
11. 11.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) unplug idle chargers (d) use LED lamps
12. 12.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
13. 13.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
14. 14.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
15. 15.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) switch off empty rooms (d) use old filament bulbs
16. 16.True or false: to switch off empty rooms saves electricity. (a) False (b) True
17. 17.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
18. 18.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
19. 19.🧾 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?
20. 20.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
21. 21.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
22. 22.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) close the fridge quickly (d) use daylight to read
23. 23.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
24. 24.True or false: to use daylight to read saves electricity. (a) True (b) False
25. 25.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
26. 26.🧾 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?
27. 27.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
29. 29.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) switch off empty rooms (d) leave the TV on standby
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 5 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: to unplug idle chargers saves electricity. (a) True (b) False
32. 32.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
33. 33.🧾 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?
34. 34.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these saves electricity? (a) leave the TV on standby (b) use LED lamps (c) iron one shirt at a time (d) leave fridge door open
36. 36.True or false: to use daylight to read wastes electricity. (a) False (b) True
37. 37.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
38. 38.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
39. 39.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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