Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 651 · 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 ₹9. What is the bill (in ₹)?
2. 2.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
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 2 hours. How many watt-hours (Wh) are saved?
4. 4.Which of these wastes electricity? (a) close the fridge quickly (b) switch off empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
5. 5.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) run fans in empty rooms (d) set the AC to 24 °C
6. 6.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
7. 7.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
9. 9.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
10. 10.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
11. 11.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
14. 14.Which of these saves electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) leave fridge door open
15. 15.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) run fans in empty rooms
16. 16.Which of these wastes electricity? (a) use LED lamps (b) use old filament bulbs (c) set the AC to 24 °C (d) use daylight to read
17. 17.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) iron one shirt at a time (d) use daylight to read
18. 18.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 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?
20. 20.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
21. 21.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.True or false: to use daylight to read wastes electricity. (a) True (b) False
24. 24.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 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
26. 26.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
27. 27.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) unplug idle chargers (d) leave fridge door open
28. 28.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
29. 29.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) unplug idle chargers
30. 30.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
31. 31.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
32. 32.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
33. 33.🧾 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?
34. 34.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
36. 36.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave the TV on standby (d) switch off empty rooms
37. 37.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
38. 38.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
39. 39.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) set the AC to 24 °C
40. 40.True or false: to leave fridge door open wastes electricity. (a) True (b) False

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