Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 757 · 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 LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) leave fridge door open
2. 2.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) close the fridge quickly
3. 3.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
4. 4.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) use daylight to read (d) set the AC to 24 °C
5. 5.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
6. 6.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
7. 7.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
9. 9.Which of these saves electricity? (a) leave the TV on standby (b) set the AC to 24 °C (c) run fans in empty rooms (d) iron one shirt at a time
10. 10.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
11. 11.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
12. 12.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
13. 13.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) iron one shirt at a time (d) use old filament bulbs
14. 14.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
16. 16.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
17. 17.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
18. 18.🧾 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?
19. 19.True or false: to leave the TV on standby saves electricity. (a) True (b) False
20. 20.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
21. 21.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
22. 22.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
23. 23.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
24. 24.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) use old filament bulbs (d) use LED lamps
25. 25.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) leave fridge door open (d) run fans in empty rooms
26. 26.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
27. 27.🔍 Which is the odd one out? (a) leave fridge door open (b) use old filament bulbs (c) use daylight to read (d) run fans in empty rooms
28. 28.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) switch off empty rooms (d) use LED lamps
29. 29.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
30. 30.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
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 5 hours. How many watt-hours (Wh) are saved?
32. 32.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) switch off empty rooms (d) leave fridge door open
35. 35.True or false: to use daylight to read wastes electricity. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
37. 37.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
38. 38.True or false: to use LED lamps wastes electricity. (a) True (b) False
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 1 hour. How many watt-hours (Wh) are saved?
40. 40.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?

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