Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 842 · 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.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
2. 2.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
3. 3.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
4. 4.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
6. 6.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
8. 8.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
9. 9.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
10. 10.🧾 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?
11. 11.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) unplug idle chargers (d) use LED lamps
12. 12.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) set the AC to 24 °C (d) use old filament bulbs
13. 13.🧾 A family uses 100 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
14. 14.Which of these wastes electricity? (a) use old filament bulbs (b) unplug idle chargers (c) use daylight to read (d) close the fridge quickly
15. 15.True or false: to use LED lamps wastes electricity. (a) True (b) False
16. 16.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) use LED lamps (d) switch off empty rooms
17. 17.True or false: to switch off empty rooms saves electricity. (a) False (b) True
18. 18.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
19. 19.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
20. 20.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
21. 21.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) leave fridge door open (d) use old filament bulbs
23. 23.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
24. 24.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
25. 25.Which of these saves electricity? (a) leave the TV on standby (b) switch off empty rooms (c) run fans in empty rooms (d) leave fridge door open
26. 26.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
27. 27.🧾 A family uses 160 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
28. 28.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
29. 29.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) close the fridge quickly (d) leave the TV on standby
30. 30.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) unplug idle chargers
31. 31.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
32. 32.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
33. 33.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
37. 37.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) leave the TV on standby (d) use old filament bulbs
38. 38.🧾 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?
39. 39.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
40. 40.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =

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