Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 824 · 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 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
2. 2.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
3. 3.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) switch off empty rooms
4. 4.Which of these wastes electricity? (a) run fans in empty rooms (b) use LED lamps (c) close the fridge quickly (d) set the AC to 24 °C
5. 5.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
6. 6.True or false: to use LED lamps wastes electricity. (a) True (b) False
7. 7.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
8. 8.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
9. 9.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) use LED lamps
10. 10.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
11. 11.🧾 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?
12. 12.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
13. 13.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) switch off empty rooms (d) leave fridge door open
14. 14.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
16. 16.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
17. 17.True or false: to use old filament bulbs saves electricity. (a) False (b) True
18. 18.🧾 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?
19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
20. 20.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
21. 21.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
23. 23.True or false: to use daylight to read saves electricity. (a) False (b) True
24. 24.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
25. 25.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) use daylight to read (d) switch off empty rooms
28. 28.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave the TV on standby (d) close the fridge quickly
29. 29.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
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 5 hours. How many watt-hours (Wh) are saved?
31. 31.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) use old filament bulbs (d) iron one shirt at a time
32. 32.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) use daylight to read (d) leave fridge door open
33. 33.🧾 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?
34. 34.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
36. 36.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) use daylight to read (d) iron one shirt at a time
37. 37.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) unplug idle chargers (d) use old filament bulbs
39. 39.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 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?

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