Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 307 · 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.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
3. 3.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
4. 4.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) set the AC to 24 °C (d) use daylight to read
6. 6.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
7. 7.🧾 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?
8. 8.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) iron one shirt at a time (d) close the fridge quickly
9. 9.True or false: to leave fridge door open saves electricity. (a) True (b) False
10. 10.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
11. 11.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
12. 12.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) unplug idle chargers (d) iron one shirt at a time
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
14. 14.🧾 A family uses 70 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
15. 15.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
16. 16.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
17. 17.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
18. 18.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
19. 19.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
20. 20.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) iron one shirt at a time (d) use daylight to read
21. 21.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
22. 22.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 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?
24. 24.Which of these saves electricity? (a) iron one shirt at a time (b) use old filament bulbs (c) use daylight to read (d) run fans in empty rooms
25. 25.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
26. 26.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) use LED lamps
27. 27.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) run fans in empty rooms (d) switch off empty rooms
29. 29.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) close the fridge quickly (d) set the AC to 24 °C
30. 30.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) set the AC to 24 °C (d) use old filament bulbs
31. 31.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
32. 32.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
33. 33.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
34. 34.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
36. 36.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) close the fridge quickly (d) use LED lamps
39. 39.🧾 A family uses 90 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
40. 40.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby

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