Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 714 · 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 family uses 190 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
2. 2.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
3. 3.True or false: to unplug idle chargers saves electricity. (a) True (b) False
4. 4.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
5. 5.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) use LED lamps (d) use old filament bulbs
6. 6.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) use LED lamps (d) set the AC to 24 °C
7. 7.🧾 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?
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
9. 9.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
10. 10.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
11. 11.True or false: to use old filament bulbs saves electricity. (a) False (b) True
12. 12.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
14. 14.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) leave fridge door open (d) unplug idle chargers
15. 15.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
16. 16.True or false: to use daylight to read wastes electricity. (a) True (b) False
17. 17.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
18. 18.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) run fans in empty rooms (d) close the fridge quickly
20. 20.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
21. 21.True or false: to use LED lamps saves electricity. (a) True (b) False
22. 22.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
23. 23.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
24. 24.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) iron one shirt at a time (d) switch off empty rooms
25. 25.True or false: to use LED lamps wastes electricity. (a) False (b) True
26. 26.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
27. 27.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
28. 28.True or false: to leave fridge door open saves electricity. (a) False (b) True
29. 29.🧾 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?
30. 30.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) run fans in empty rooms (d) use old filament bulbs
31. 31.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these wastes electricity? (a) switch off empty rooms (b) set the AC to 24 °C (c) use old filament bulbs (d) use LED lamps
33. 33.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) unplug idle chargers (d) set the AC to 24 °C
35. 35.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
36. 36.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
38. 38.🧾 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?
39. 39.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) close the fridge quickly (d) use daylight to read
40. 40.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity

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