Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 646 · 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.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
3. 3.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) switch off empty rooms (d) set the AC to 24 °C
4. 4.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) switch off empty rooms (d) leave the TV on standby
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 watt (d) 1 ampere
6. 6.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
7. 7.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
10. 10.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) use daylight to read
11. 11.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) iron one shirt at a time (d) use LED lamps
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 unplug idle chargers? (a) wastes electricity (b) saves electricity
14. 14.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
15. 15.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) set the AC to 24 °C (d) use daylight to read
16. 16.🧾 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
17. 17.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
18. 18.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 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?
21. 21.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A family uses 80 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
23. 23.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
24. 24.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
26. 26.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
27. 27.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) run fans in empty rooms (d) close the fridge quickly
28. 28.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
29. 29.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) run fans in empty rooms (d) use LED lamps
30. 30.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
31. 31.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) switch off empty rooms (d) close the fridge quickly
32. 32.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
33. 33.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
34. 34.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) leave fridge door open (d) set the AC to 24 °C
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 5 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) run fans in empty rooms (d) iron one shirt at a time
39. 39.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
40. 40.🧾 A family uses 20 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?

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