Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 760 · 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 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
2. 2.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
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 5 hours. How many watt-hours (Wh) are saved?
4. 4.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) close the fridge quickly (d) use daylight to read
6. 6.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
7. 7.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
8. 8.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) use LED lamps (d) leave fridge door open
9. 9.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
11. 11.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
12. 12.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) set the AC to 24 °C
13. 13.🧾 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?
14. 14.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) iron one shirt at a time (d) run fans in empty rooms
15. 15.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
16. 16.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave fridge door open (d) close the fridge quickly
17. 17.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) unplug idle chargers (d) switch off empty rooms
18. 18.🧾 A family uses 40 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
19. 19.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
20. 20.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
22. 22.Which of these wastes electricity? (a) leave fridge door open (b) unplug idle chargers (c) switch off empty rooms (d) use LED lamps
23. 23.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) use old filament bulbs (d) use daylight to read
24. 24.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
25. 25.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
27. 27.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) set the AC to 24 °C (d) unplug idle chargers
28. 28.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
29. 29.True or false: to use LED lamps saves electricity. (a) False (b) True
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 4 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
32. 32.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave fridge door open (d) use daylight to read
33. 33.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) leave fridge door open (d) iron one shirt at a time
34. 34.True or false: to use daylight to read wastes electricity. (a) True (b) False
35. 35.True or false: to use old filament bulbs saves electricity. (a) True (b) False
36. 36.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
37. 37.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
38. 38.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) set the AC to 24 °C (d) leave the TV on standby
39. 39.🔍 Which is the odd one out? (a) close the fridge quickly (b) iron one shirt at a time (c) use LED lamps (d) use daylight to read
40. 40.🧾 A family uses 160 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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