Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 648 · 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 use LED lamps? (a) wastes electricity (b) saves electricity
2. 2.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
3. 3.🧾 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?
4. 4.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
5. 5.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
6. 6.Which of these saves electricity? (a) leave the TV on standby (b) use daylight to read (c) run fans in empty rooms (d) leave fridge door open
7. 7.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
8. 8.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.Which of these wastes electricity? (a) use daylight to read (b) iron one shirt at a time (c) unplug idle chargers (d) set the AC to 24 °C
10. 10.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
12. 12.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
13. 13.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
16. 16.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) leave the TV on standby (d) use LED lamps
17. 17.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
19. 19.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
20. 20.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
21. 21.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) switch off empty rooms (d) use old filament bulbs
22. 22.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
23. 23.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
24. 24.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
26. 26.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) leave the TV on standby (d) use daylight to read
28. 28.🧾 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?
29. 29.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
31. 31.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
32. 32.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) switch off empty rooms (d) use old filament bulbs
35. 35.🧾 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?
36. 36.🧾 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?
37. 37.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) use LED lamps (d) iron one shirt at a time
38. 38.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
39. 39.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
40. 40.True or false: to unplug idle chargers saves electricity. (a) True (b) False

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