Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 754 · 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 9 hours. How many watt-hours (Wh) are saved?
2. 2.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
3. 3.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
4. 4.True or false: to close the fridge quickly saves electricity. (a) False (b) True
5. 5.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
6. 6.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
8. 8.🧾 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?
9. 9.Which of these wastes electricity? (a) use LED lamps (b) iron one shirt at a time (c) unplug idle chargers (d) switch off empty rooms
10. 10.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) iron one shirt at a time (d) leave fridge door open
11. 11.True or false: to leave fridge door open wastes electricity. (a) False (b) True
12. 12.Which of these wastes electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) use daylight to read (d) switch off empty rooms
13. 13.Which of these saves electricity? (a) unplug idle chargers (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
14. 14.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) use old filament bulbs (d) switch off empty rooms
15. 15.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) unplug idle chargers (d) leave fridge door open
17. 17.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
18. 18.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) close the fridge quickly
19. 19.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 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?
21. 21.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) close the fridge quickly (b) set the AC to 24 °C (c) leave fridge door open (d) use daylight to read
23. 23.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
24. 24.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
25. 25.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) use LED lamps (d) leave the TV on standby
26. 26.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) close the fridge quickly (d) switch off empty rooms
28. 28.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
29. 29.True or false: to use daylight to read saves electricity. (a) False (b) True
30. 30.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
31. 31.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
32. 32.True or false: to switch off empty rooms saves electricity. (a) False (b) True
33. 33.🧾 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?
34. 34.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
37. 37.True or false: to unplug idle chargers saves electricity. (a) True (b) False
38. 38.True or false: to leave fridge door open saves electricity. (a) True (b) False
39. 39.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
40. 40.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?

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