Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 974 · 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 family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
2. 2.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
3. 3.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
4. 4.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) run fans in empty rooms (d) use LED lamps
5. 5.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) close the fridge quickly
6. 6.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
9. 9.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
10. 10.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
11. 11.🔍 Which is the odd one out? (a) use LED lamps (b) unplug idle chargers (c) run fans in empty rooms (d) set the AC to 24 °C
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.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) close the fridge quickly (d) set the AC to 24 °C
14. 14.True or false: to leave the TV on standby saves electricity. (a) False (b) True
15. 15.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
16. 16.True or false: to close the fridge quickly saves electricity. (a) True (b) False
17. 17.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) leave the TV on standby (d) use LED lamps
18. 18.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.True or false: to switch off empty rooms saves electricity. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) run fans in empty rooms (d) leave the TV on standby
21. 21.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
22. 22.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
23. 23.Which of these wastes electricity? (a) leave the TV on standby (b) switch off empty rooms (c) set the AC to 24 °C (d) close the fridge quickly
24. 24.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
25. 25.🧾 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?
26. 26.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
27. 27.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
28. 28.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
29. 29.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
30. 30.🧾 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?
31. 31.🧾 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?
32. 32.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) iron one shirt at a time
33. 33.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) leave fridge door open
34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
35. 35.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) leave fridge door open (d) iron one shirt at a time
39. 39.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
40. 40.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?

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