Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 48 · 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.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
3. 3.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
4. 4.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
5. 5.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
6. 6.True or false: to use old filament bulbs saves electricity. (a) True (b) False
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 2 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
9. 9.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
10. 10.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) close the fridge quickly (d) leave fridge door open
11. 11.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave fridge door open (d) iron one shirt at a time
12. 12.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
13. 13.True or false: to unplug idle chargers saves electricity. (a) False (b) True
14. 14.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) close the fridge quickly (d) switch off empty rooms
15. 15.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
16. 16.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
17. 17.True or false: to use daylight to read saves electricity. (a) True (b) False
18. 18.True or false: to use LED lamps wastes electricity. (a) True (b) False
19. 19.🧾 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?
20. 20.True or false: to leave fridge door open saves electricity. (a) True (b) False
21. 21.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
22. 22.🧾 A family uses 80 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
23. 23.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
24. 24.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
25. 25.True or false: to close the fridge quickly saves electricity. (a) True (b) False
26. 26.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
27. 27.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
28. 28.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
29. 29.True or false: to leave the TV on standby saves electricity. (a) False (b) True
30. 30.True or false: to leave fridge door open wastes electricity. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
32. 32.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) switch off empty rooms
34. 34.🧾 A family uses 140 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
35. 35.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
36. 36.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
37. 37.True or false: to use LED lamps saves electricity. (a) False (b) True
38. 38.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
39. 39.🧾 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?
40. 40.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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