Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 126 · 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 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
3. 3.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
4. 4.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
6. 6.💡 Does it save or waste electricity to use LED lamps? (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 10 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
10. 10.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
11. 11.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
14. 14.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) leave the TV on standby
15. 15.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
16. 16.Which of these saves electricity? (a) iron one shirt at a time (b) set the AC to 24 °C (c) run fans in empty rooms (d) use old filament bulbs
17. 17.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
18. 18.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
19. 19.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
20. 20.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
21. 21.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) leave fridge door open (d) use LED lamps
22. 22.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) leave the TV on standby (d) run fans in empty rooms
23. 23.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
24. 24.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
26. 26.🔍 Which is the odd one out? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) use daylight to read
27. 27.🧾 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?
28. 28.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) leave fridge door open (d) unplug idle chargers
29. 29.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
30. 30.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use LED lamps (d) iron one shirt at a time
32. 32.True or false: to leave fridge door open saves electricity. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) set the AC to 24 °C
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 3 hours. How many watt-hours (Wh) are saved?
35. 35.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
36. 36.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
37. 37.True or false: to unplug idle chargers saves electricity. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) switch off empty rooms
39. 39.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
40. 40.True or false: to leave the TV on standby saves electricity. (a) False (b) True

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