Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 128 · 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 130 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
2. 2.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
3. 3.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
4. 4.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) use old filament bulbs (d) run fans in empty rooms
6. 6.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
7. 7.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
8. 8.🧾 A family uses 180 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
9. 9.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
10. 10.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
11. 11.True or false: to leave fridge door open saves electricity. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) use daylight to read (d) set the AC to 24 °C
13. 13.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) switch off empty rooms (d) use LED lamps
14. 14.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
15. 15.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) use LED lamps
16. 16.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
18. 18.True or false: to use daylight to read saves electricity. (a) False (b) True
19. 19.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 fridge door open
20. 20.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) set the AC to 24 °C (d) use old filament bulbs
21. 21.🧾 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?
22. 22.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
23. 23.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 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?
25. 25.Which of these wastes electricity? (a) close the fridge quickly (b) use old filament bulbs (c) unplug idle chargers (d) use LED lamps
26. 26.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) leave fridge door open (d) iron one shirt at a time
27. 27.True or false: to use LED lamps saves electricity. (a) True (b) False
28. 28.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
29. 29.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
30. 30.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
31. 31.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
34. 34.🧾 A family uses 180 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 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?
37. 37.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
38. 38.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) leave fridge door open (d) use daylight to read
39. 39.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) iron one shirt at a time (d) use old filament bulbs
40. 40.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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