Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 888 · 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 1000 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 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
3. 3.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
4. 4.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
5. 5.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) use daylight to read (d) use LED lamps
6. 6.🧾 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?
7. 7.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
8. 8.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
9. 9.🧾 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?
10. 10.Which of these saves electricity? (a) run fans in empty rooms (b) use LED lamps (c) use old filament bulbs (d) leave fridge door open
11. 11.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
12. 12.🧾 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?
13. 13.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
15. 15.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
16. 16.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
17. 17.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) leave fridge door open (d) set the AC to 24 °C
18. 18.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) iron one shirt at a time
20. 20.🧾 A family uses 180 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
21. 21.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
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 8 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 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?
24. 24.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
25. 25.Which of these saves electricity? (a) close the fridge quickly (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
26. 26.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
27. 27.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
29. 29.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
30. 30.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
31. 31.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) switch off empty rooms
32. 32.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) iron one shirt at a time
34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
35. 35.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
37. 37.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) use daylight to read (d) use LED lamps
38. 38.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
40. 40.Which of these wastes electricity? (a) close the fridge quickly (b) use old filament bulbs (c) use daylight to read (d) set the AC to 24 °C

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