Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 432 · 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 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
2. 2.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
3. 3.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
4. 4.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
5. 5.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave fridge door open (d) use LED lamps
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
7. 7.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
8. 8.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
10. 10.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
11. 11.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
12. 12.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
14. 14.True or false: to use daylight to read wastes electricity. (a) False (b) True
15. 15.🧾 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?
16. 16.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
17. 17.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
18. 18.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
19. 19.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) set the AC to 24 °C (d) switch off empty rooms
20. 20.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
21. 21.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
22. 22.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) run fans in empty rooms (d) set the AC to 24 °C
23. 23.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.True or false: to switch off empty rooms saves electricity. (a) True (b) False
25. 25.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
26. 26.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.🧾 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?
29. 29.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) use LED lamps (d) iron one shirt at a time
30. 30.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
32. 32.🧾 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
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.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
35. 35.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) use daylight to read
37. 37.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
38. 38.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
39. 39.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) unplug idle chargers (d) set the AC to 24 °C
40. 40.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) close the fridge quickly (d) use old filament bulbs

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