Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 193 · 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.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) use daylight to read
2. 2.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
3. 3.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
4. 4.True or false: to use daylight to read saves electricity. (a) False (b) True
5. 5.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
6. 6.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
7. 7.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
8. 8.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
9. 9.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
11. 11.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
13. 13.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
14. 14.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
15. 15.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.True or false: to use LED lamps saves electricity. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) leave the TV on standby (d) use daylight to read
18. 18.🧾 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?
19. 19.Which of these wastes electricity? (a) use LED lamps (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
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 3 hours. How many watt-hours (Wh) are saved?
21. 21.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
22. 22.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
23. 23.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
24. 24.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
25. 25.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
26. 26.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
28. 28.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use daylight to read (d) use old filament bulbs
29. 29.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) run fans in empty rooms (d) switch off empty rooms
30. 30.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
31. 31.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) use LED lamps (d) run fans in empty rooms
32. 32.🧾 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?
33. 33.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) close the fridge quickly
36. 36.🧾 A family uses 80 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.🔍 Which is the odd one out? (a) unplug idle chargers (b) use old filament bulbs (c) iron one shirt at a time (d) run fans in empty rooms
38. 38.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
39. 39.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
40. 40.True or false: to switch off empty rooms saves electricity. (a) False (b) True

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