Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 289 · 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 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
2. 2.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 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
4. 4.🧾 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?
5. 5.True or false: to close the fridge quickly saves electricity. (a) False (b) True
6. 6.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) run fans in empty rooms
7. 7.Which of these wastes electricity? (a) close the fridge quickly (b) use old filament bulbs (c) use LED lamps (d) switch off empty rooms
8. 8.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
9. 9.🧾 A family uses 120 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
10. 10.Which of these wastes electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) set the AC to 24 °C (d) unplug idle chargers
11. 11.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
12. 12.True or false: to use daylight to read saves electricity. (a) False (b) True
13. 13.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
14. 14.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) leave the TV on standby (d) switch off empty rooms
15. 15.True or false: to switch off empty rooms saves electricity. (a) False (b) True
16. 16.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
17. 17.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) switch off empty rooms (d) iron one shirt at a time
18. 18.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
20. 20.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
21. 21.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use old filament bulbs (d) leave the TV on standby
23. 23.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 daylight to read
24. 24.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use LED lamps (d) leave the TV on standby
25. 25.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
26. 26.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) iron one shirt at a time (d) leave fridge door open
27. 27.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to leave fridge door open wastes electricity. (a) False (b) True
29. 29.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
30. 30.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
31. 31.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use daylight to read (d) leave the TV on standby
33. 33.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
34. 34.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
35. 35.🧾 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?
36. 36.Which of these saves electricity? (a) leave fridge door open (b) use LED lamps (c) leave the TV on standby (d) run fans in empty rooms
37. 37.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
38. 38.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) close the fridge quickly (d) use LED lamps
39. 39.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
40. 40.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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