Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 76 · 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 4 hours. How many watt-hours (Wh) are saved?
2. 2.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) a candle (d) an LED lamp
3. 3.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
4. 4.True or false: to use LED lamps saves electricity. (a) True (b) False
5. 5.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
6. 6.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
7. 7.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
8. 8.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 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?
10. 10.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
14. 14.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) leave the TV on standby (d) unplug idle chargers
15. 15.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) use LED lamps (d) set the AC to 24 °C
16. 16.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) set the AC to 24 °C (d) use daylight to read
17. 17.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
18. 18.True or false: to use LED lamps wastes electricity. (a) True (b) False
19. 19.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
20. 20.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
21. 21.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
22. 22.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A family uses 190 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
24. 24.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
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 9 hours. How many watt-hours (Wh) are saved?
26. 26.🔍 Which is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) use old filament bulbs (d) unplug idle chargers
27. 27.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
28. 28.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
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 10 hours. How many watt-hours (Wh) are saved?
30. 30.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) set the AC to 24 °C
31. 31.🧾 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?
32. 32.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) close the fridge quickly
33. 33.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
34. 34.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
35. 35.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) unplug idle chargers
36. 36.True or false: to switch off empty rooms saves electricity. (a) False (b) True
37. 37.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) set the AC to 24 °C
38. 38.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
39. 39.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
40. 40.True or false: to leave the TV on standby wastes electricity. (a) False (b) True

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