Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 541 · 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.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 watt (d) 1 kilowatt-hour (kWh)
2. 2.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
3. 3.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
4. 4.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) use LED lamps (d) use old filament bulbs
5. 5.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
6. 6.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) close the fridge quickly (d) use LED lamps
7. 7.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) run fans in empty rooms
8. 8.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) use daylight to read (b) leave the TV on standby (c) close the fridge quickly (d) use LED lamps
10. 10.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
11. 11.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
12. 12.True or false: to leave the TV on standby saves electricity. (a) True (b) False
13. 13.Which of these wastes electricity? (a) iron one shirt at a time (b) use LED lamps (c) unplug idle chargers (d) set the AC to 24 °C
14. 14.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
15. 15.🔍 Which is the odd one out? (a) unplug idle chargers (b) use LED lamps (c) use old filament bulbs (d) use daylight to read
16. 16.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
17. 17.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use LED lamps
18. 18.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
19. 19.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
20. 20.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
21. 21.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) use LED lamps (d) run fans in empty rooms
22. 22.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) run fans in empty rooms (d) iron one shirt at a time
23. 23.Which of these wastes electricity? (a) use LED lamps (b) leave fridge door open (c) close the fridge quickly (d) switch off empty rooms
24. 24.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
28. 28.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
29. 29.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
30. 30.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
31. 31.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
34. 34.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) use daylight to read (d) leave fridge door open
35. 35.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
36. 36.🧾 A family uses 90 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
37. 37.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
39. 39.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
40. 40.True or false: to use LED lamps saves electricity. (a) False (b) True

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