Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 710 · 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) switch off empty rooms (b) close the fridge quickly (c) set the AC to 24 °C (d) run fans in empty rooms
2. 2.🧾 A family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
3. 3.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
4. 4.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
5. 5.True or false: to leave fridge door open wastes electricity. (a) False (b) True
6. 6.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
7. 7.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) iron one shirt at a time (d) close the fridge quickly
8. 8.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
9. 9.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) iron one shirt at a time
10. 10.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) iron one shirt at a time (d) unplug idle chargers
11. 11.🧾 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?
12. 12.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) run fans in empty rooms (d) use LED lamps
13. 13.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.🔍 Which is the odd one out? (a) use old filament bulbs (b) run fans in empty rooms (c) leave fridge door open (d) close the fridge quickly
15. 15.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) run fans in empty rooms (d) use old filament bulbs
16. 16.True or false: to use LED lamps wastes electricity. (a) True (b) False
17. 17.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) unplug idle chargers (d) leave the TV on standby
18. 18.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
19. 19.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
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 7 hours. How many watt-hours (Wh) are saved?
21. 21.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
22. 22.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) use daylight to read (d) leave the TV on standby
23. 23.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) leave fridge door open (d) use LED lamps
25. 25.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
26. 26.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 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?
28. 28.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
29. 29.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) use LED lamps (d) run fans in empty rooms
30. 30.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
31. 31.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
32. 32.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
33. 33.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
34. 34.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
35. 35.Which of these wastes electricity? (a) leave fridge door open (b) use daylight to read (c) switch off empty rooms (d) set the AC to 24 °C
36. 36.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
38. 38.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
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 2 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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