Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 819 · 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 run fans in empty rooms? (a) wastes electricity (b) saves electricity
2. 2.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) leave the TV on standby (d) close the fridge quickly
3. 3.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
4. 4.Which of these saves electricity? (a) use LED lamps (b) leave the TV on standby (c) run fans in empty rooms (d) leave fridge door open
5. 5.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
7. 7.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) use daylight to read (d) switch off empty rooms
8. 8.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
10. 10.Which of these wastes electricity? (a) switch off empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) close the fridge quickly
11. 11.True or false: to use daylight to read saves electricity. (a) True (b) False
12. 12.💡 Does it save or waste electricity to use old filament bulbs? (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.Which of these saves electricity? (a) use old filament bulbs (b) unplug idle chargers (c) leave fridge door open (d) leave the TV on standby
15. 15.🧾 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?
16. 16.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
18. 18.Which of these wastes electricity? (a) use LED lamps (b) leave the TV on standby (c) switch off empty rooms (d) use daylight to read
19. 19.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
21. 21.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
22. 22.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) set the AC to 24 °C (d) leave fridge door open
23. 23.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) use daylight to read (d) use LED lamps
24. 24.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
25. 25.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
26. 26.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
27. 27.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
29. 29.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
30. 30.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
31. 31.Which of these saves electricity? (a) use daylight to read (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
32. 32.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) switch off empty rooms (d) run fans in empty rooms
35. 35.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
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 8 hours. How many watt-hours (Wh) are saved?
37. 37.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
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 10 hours. How many watt-hours (Wh) are saved?
39. 39.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) set the AC to 24 °C
40. 40.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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