Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 713 · 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 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
2. 2.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
3. 3.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
4. 4.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
5. 5.🔍 Which is the odd one out? (a) switch off empty rooms (b) use old filament bulbs (c) leave fridge door open (d) iron one shirt at a time
6. 6.True or false: to use LED lamps wastes electricity. (a) True (b) False
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 5 hours. How many watt-hours (Wh) are saved?
8. 8.🧾 A family uses 110 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
9. 9.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) leave fridge door open (d) run fans in empty rooms
10. 10.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) use LED lamps
11. 11.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) unplug idle chargers
12. 12.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) set the AC to 24 °C (d) use LED lamps
13. 13.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
14. 14.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
15. 15.True or false: to leave fridge door open saves electricity. (a) True (b) False
16. 16.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A family uses 20 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
18. 18.🧾 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?
19. 19.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) leave fridge door open (d) set the AC to 24 °C
20. 20.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
21. 21.True or false: to use old filament bulbs saves electricity. (a) True (b) False
22. 22.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
25. 25.Which of these saves electricity? (a) leave fridge door open (b) unplug idle chargers (c) use old filament bulbs (d) run fans in empty rooms
26. 26.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
29. 29.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
30. 30.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) iron one shirt at a time (d) leave fridge door open
31. 31.🧾 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?
32. 32.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
33. 33.Which of these wastes electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) unplug idle chargers (d) use LED lamps
34. 34.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
35. 35.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) use old filament bulbs
36. 36.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
37. 37.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
39. 39.True or false: to use daylight to read saves electricity. (a) True (b) False
40. 40.True or false: to use daylight to read wastes electricity. (a) False (b) True

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