Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 453 · 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 is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) unplug idle chargers (d) use daylight to read
2. 2.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
3. 3.True or false: to unplug idle chargers saves electricity. (a) True (b) False
4. 4.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use daylight to read (d) leave the TV on standby
5. 5.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
6. 6.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) iron one shirt at a time (d) close the fridge quickly
7. 7.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) leave fridge door open (d) use LED lamps
8. 8.True or false: to leave the TV on standby saves electricity. (a) True (b) False
9. 9.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
11. 11.🧾 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?
12. 12.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
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 6 hours. How many watt-hours (Wh) are saved?
14. 14.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
15. 15.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
16. 16.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
18. 18.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) an oil lamp (d) a filament bulb
20. 20.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
21. 21.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) use old filament bulbs (d) leave the TV on standby
23. 23.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) use LED lamps
24. 24.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
25. 25.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
27. 27.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to use LED lamps saves electricity. (a) False (b) True
30. 30.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) iron one shirt at a time (d) run fans in empty rooms
31. 31.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
33. 33.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) unplug idle chargers (d) switch off empty rooms
34. 34.🧾 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?
35. 35.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) close the fridge quickly (d) use daylight to read
37. 37.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
38. 38.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
39. 39.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) run fans in empty rooms (d) use daylight to read
40. 40.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity

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