Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 984 · 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) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) switch off empty rooms
2. 2.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
3. 3.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) leave the TV on standby (d) use LED lamps
4. 4.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
7. 7.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) iron one shirt at a time (d) leave fridge door open
8. 8.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) leave the TV on standby (d) switch off empty rooms
9. 9.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
10. 10.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
11. 11.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) use daylight to read (d) leave fridge door open
12. 12.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 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?
14. 14.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
15. 15.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
16. 16.True or false: to leave fridge door open saves electricity. (a) False (b) True
17. 17.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) leave the TV on standby (d) run fans in empty rooms
18. 18.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) run fans in empty rooms (d) leave fridge door open
20. 20.🔍 Which is the odd one out? (a) use LED lamps (b) leave fridge door open (c) unplug idle chargers (d) set the AC to 24 °C
21. 21.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
23. 23.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
24. 24.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
25. 25.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
26. 26.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
27. 27.🧾 A family uses 200 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
29. 29.🧾 A family uses 110 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
30. 30.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
31. 31.🧾 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?
32. 32.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) set the AC to 24 °C (d) unplug idle chargers
33. 33.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
34. 34.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
35. 35.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
36. 36.🧾 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?
37. 37.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
38. 38.True or false: to use daylight to read wastes electricity. (a) True (b) False
39. 39.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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