Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 850 · 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.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
2. 2.True or false: to use old filament bulbs saves electricity. (a) True (b) False
3. 3.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 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?
5. 5.Which of these saves electricity? (a) use daylight to read (b) leave the TV on standby (c) use old filament bulbs (d) leave fridge door open
6. 6.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
7. 7.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) switch off empty rooms (d) leave fridge door open
8. 8.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
9. 9.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
10. 10.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
11. 11.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) use old filament bulbs
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 7 hours. How many watt-hours (Wh) are saved?
13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
14. 14.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
15. 15.True or false: to use daylight to read saves electricity. (a) False (b) True
16. 16.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
17. 17.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
18. 18.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
19. 19.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
20. 20.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
21. 21.🧾 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?
22. 22.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) run fans in empty rooms (d) switch off empty rooms
23. 23.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.Which of these saves electricity? (a) use old filament bulbs (b) close the fridge quickly (c) iron one shirt at a time (d) run fans in empty rooms
25. 25.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
26. 26.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
27. 27.🧾 A family uses 70 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
28. 28.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
30. 30.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use LED lamps (d) leave the TV on standby
31. 31.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.True or false: to close the fridge quickly saves electricity. (a) False (b) True
34. 34.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
35. 35.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
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 1 hour. How many watt-hours (Wh) are saved?
38. 38.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
39. 39.🧾 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?
40. 40.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True

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