Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 607 · 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.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) leave the TV on standby
2. 2.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
3. 3.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
5. 5.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
6. 6.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
7. 7.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
8. 8.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
9. 9.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) set the AC to 24 °C (d) leave fridge door open
10. 10.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
11. 11.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) iron one shirt at a time
12. 12.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
13. 13.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) unplug idle chargers (d) set the AC to 24 °C
14. 14.True or false: to leave the TV on standby saves electricity. (a) True (b) False
15. 15.True or false: to use daylight to read saves electricity. (a) False (b) True
16. 16.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
17. 17.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
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 switch off empty rooms? (a) wastes electricity (b) saves electricity
20. 20.Which of these wastes electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) close the fridge quickly (d) set the AC to 24 °C
21. 21.True or false: to use daylight to read wastes electricity. (a) True (b) False
22. 22.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 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?
24. 24.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
25. 25.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
26. 26.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
27. 27.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) iron one shirt at a time (d) run fans in empty rooms
28. 28.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 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?
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 6 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
32. 32.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) iron one shirt at a time
34. 34.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) use old filament bulbs (d) leave the TV on standby
35. 35.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
36. 36.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) leave fridge door open (d) leave the TV on standby
37. 37.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) use daylight to read
39. 39.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

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