Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 360 · 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 close the fridge quickly? (a) saves electricity (b) wastes electricity
2. 2.Which of these wastes electricity? (a) use daylight to read (b) switch off empty rooms (c) use LED lamps (d) run fans in empty rooms
3. 3.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) use LED lamps (d) leave the TV on standby
4. 4.True or false: to use daylight to read saves electricity. (a) True (b) False
5. 5.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
6. 6.🧾 A family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
7. 7.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
8. 8.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
9. 9.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
11. 11.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
13. 13.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
14. 14.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
15. 15.True or false: to close the fridge quickly saves electricity. (a) True (b) False
16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
17. 17.🧾 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?
18. 18.🧾 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?
19. 19.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
20. 20.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
21. 21.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
22. 22.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
23. 23.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) unplug idle chargers (d) leave the TV on standby
24. 24.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) leave the TV on standby (d) use LED lamps
25. 25.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
26. 26.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
27. 27.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
28. 28.🔍 Which is the odd one out? (a) use LED lamps (b) switch off empty rooms (c) set the AC to 24 °C (d) iron one shirt at a time
29. 29.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
30. 30.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) iron one shirt at a time (d) leave fridge door open
31. 31.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) run fans in empty rooms (d) set the AC to 24 °C
32. 32.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
33. 33.True or false: to unplug idle chargers saves electricity. (a) False (b) True
34. 34.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) leave fridge door open (d) unplug idle chargers
35. 35.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 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?
37. 37.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
38. 38.True or false: to leave fridge door open wastes electricity. (a) True (b) False
39. 39.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =

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