Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 303 · 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 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
2. 2.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) run fans in empty rooms (d) use daylight to read
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
4. 4.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
5. 5.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
6. 6.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
9. 9.Which of these saves electricity? (a) leave fridge door open (b) set the AC to 24 °C (c) use old filament bulbs (d) run fans in empty rooms
10. 10.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
11. 11.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) use LED lamps (d) unplug idle chargers
12. 12.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) run fans in empty rooms (d) use old filament bulbs
13. 13.True or false: to use old filament bulbs saves electricity. (a) True (b) False
14. 14.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
15. 15.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) use daylight to read (d) set the AC to 24 °C
16. 16.True or false: to use LED lamps saves electricity. (a) True (b) False
17. 17.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
19. 19.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) leave fridge door open (d) unplug idle chargers
20. 20.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) run fans in empty rooms (d) switch off empty rooms
21. 21.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
22. 22.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
24. 24.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open
25. 25.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
26. 26.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave the TV on standby (d) use LED lamps
27. 27.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
29. 29.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to leave fridge door open saves electricity. (a) False (b) True
32. 32.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
33. 33.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
34. 34.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) leave fridge door open (d) switch off empty rooms
35. 35.True or false: to use daylight to read saves electricity. (a) False (b) True
36. 36.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
37. 37.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
39. 39.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
40. 40.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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