Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 590 · 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 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
2. 2.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
3. 3.True or false: to use LED lamps wastes electricity. (a) True (b) False
4. 4.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
6. 6.🧾 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
7. 7.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use old filament bulbs (d) use daylight to read
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
9. 9.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
11. 11.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) close the fridge quickly (d) switch off empty rooms
12. 12.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
13. 13.True or false: to use daylight to read saves electricity. (a) True (b) False
14. 14.Which of these wastes electricity? (a) use daylight to read (b) run fans in empty rooms (c) use LED lamps (d) close the fridge quickly
15. 15.🧾 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?
16. 16.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
17. 17.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
18. 18.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use LED lamps (d) iron one shirt at a time
19. 19.True or false: to switch off empty rooms saves electricity. (a) True (b) False
20. 20.🧾 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?
21. 21.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) run fans in empty rooms (d) leave the TV on standby
22. 22.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) close the fridge quickly
23. 23.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
24. 24.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) leave the TV on standby (d) use LED lamps
25. 25.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
26. 26.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
27. 27.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) leave fridge door open (d) set the AC to 24 °C
28. 28.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
29. 29.🧾 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?
30. 30.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) iron one shirt at a time (d) leave fridge door open
32. 32.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 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?
34. 34.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) use daylight to read
36. 36.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) switch off empty rooms (d) use old filament bulbs
37. 37.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) close the fridge quickly
38. 38.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
39. 39.True or false: to unplug idle chargers saves electricity. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) run fans in empty rooms (d) leave fridge door open

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