Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 851 · 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) leave fridge door open (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 the TV on standby (c) leave fridge door open (d) use daylight to read
3. 3.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
4. 4.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
5. 5.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) close the fridge quickly (d) switch off empty rooms
6. 6.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) run fans in empty rooms (d) iron one shirt at a time
7. 7.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) use old filament bulbs (d) leave fridge door open
8. 8.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
9. 9.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
10. 10.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) leave the TV on standby (d) leave fridge door open
11. 11.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
12. 12.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) use daylight to read (d) set the AC to 24 °C
13. 13.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
14. 14.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
15. 15.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
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 8 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.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 LED lamps
19. 19.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
20. 20.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
21. 21.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
23. 23.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
24. 24.Which of these saves electricity? (a) iron one shirt at a time (b) close the fridge quickly (c) leave fridge door open (d) run fans in empty rooms
25. 25.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
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 3 hours. How many watt-hours (Wh) are saved?
27. 27.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) close the fridge quickly (d) run fans in empty rooms
28. 28.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
29. 29.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) run fans in empty rooms (d) leave the TV on standby
30. 30.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
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 1 hour. How many watt-hours (Wh) are saved?
32. 32.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
33. 33.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) use LED lamps (d) switch off empty rooms
34. 34.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
35. 35.True or false: to use old filament bulbs saves electricity. (a) False (b) True
36. 36.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 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?
40. 40.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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