Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 485 · 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 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
2. 2.🧾 A family uses 50 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
3. 3.🧾 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?
4. 4.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
5. 5.True or false: to unplug idle chargers saves electricity. (a) False (b) True
6. 6.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
7. 7.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) run fans in empty rooms (d) use old filament bulbs
8. 8.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
9. 9.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
10. 10.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) set the AC to 24 °C (d) iron one shirt at a time
11. 11.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
12. 12.True or false: to use old filament bulbs saves electricity. (a) True (b) False
13. 13.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) leave fridge door open
14. 14.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
15. 15.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) use old filament bulbs (d) close the fridge quickly
16. 16.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) set the AC to 24 °C (d) leave fridge door open
17. 17.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
18. 18.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
19. 19.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
20. 20.Which of these wastes electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) unplug idle chargers (d) close the fridge quickly
21. 21.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
22. 22.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
23. 23.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.True or false: to use daylight to read saves electricity. (a) False (b) True
25. 25.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
26. 26.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) leave the TV on standby (d) use old filament bulbs
27. 27.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
28. 28.🔍 Which is the odd one out? (a) unplug idle chargers (b) use daylight to read (c) close the fridge quickly (d) iron one shirt at a time
29. 29.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) use daylight to read (d) run fans in empty rooms
30. 30.🧾 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
31. 31.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
32. 32.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
33. 33.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) close the fridge quickly (d) iron one shirt at a time
34. 34.🧾 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?
35. 35.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
36. 36.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A family uses 150 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
40. 40.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) set the AC to 24 °C (d) leave fridge door open

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