Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 269 · 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 wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) leave fridge door open (d) use LED lamps
2. 2.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
3. 3.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
4. 4.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
5. 5.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
7. 7.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
8. 8.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
9. 9.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
11. 11.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.🧾 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?
13. 13.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) leave the TV on standby (d) switch off empty rooms
14. 14.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) use LED lamps
15. 15.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) unplug idle chargers
16. 16.🧾 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?
17. 17.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
18. 18.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) use daylight to read (d) leave fridge door open
20. 20.True or false: to use LED lamps wastes electricity. (a) True (b) False
21. 21.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
22. 22.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) set the AC to 24 °C
23. 23.True or false: to use daylight to read saves electricity. (a) False (b) True
24. 24.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
25. 25.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
27. 27.🧾 A family uses 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
31. 31.🧾 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?
32. 32.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) close the fridge quickly
33. 33.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
34. 34.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
35. 35.🔍 Which is the odd one out? (a) use LED lamps (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
36. 36.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
37. 37.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) unplug idle chargers (d) leave the TV on standby
39. 39.True or false: to leave fridge door open saves electricity. (a) False (b) True
40. 40.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) set the AC to 24 °C (d) leave fridge door open

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