Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 503 · 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.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
3. 3.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
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 6 hours. How many watt-hours (Wh) are saved?
8. 8.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) switch off empty rooms (d) run fans in empty rooms
9. 9.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) switch off empty rooms (d) leave fridge door open
10. 10.True or false: to leave the TV on standby saves electricity. (a) False (b) True
11. 11.True or false: to leave fridge door open saves electricity. (a) True (b) False
12. 12.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
13. 13.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) leave the TV on standby (d) switch off empty rooms
14. 14.🧾 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?
15. 15.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
16. 16.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.True or false: to use LED lamps saves electricity. (a) True (b) False
18. 18.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
19. 19.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
21. 21.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) use old filament bulbs (d) iron one shirt at a time
23. 23.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
24. 24.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
25. 25.Which of these wastes electricity? (a) switch off empty rooms (b) leave the TV on standby (c) close the fridge quickly (d) unplug idle chargers
26. 26.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
27. 27.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use daylight to read (d) use old filament bulbs
28. 28.🧾 A family uses 60 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
29. 29.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
31. 31.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
32. 32.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) set the AC to 24 °C (d) use daylight to read
33. 33.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave fridge door open (d) use daylight to read
34. 34.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
36. 36.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
37. 37.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
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.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) use old filament bulbs (d) close the fridge quickly

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