Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 27 · 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 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) leave fridge door open
3. 3.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
4. 4.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
5. 5.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) close the fridge quickly (d) leave the TV on standby
6. 6.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
7. 7.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
8. 8.🔍 Which is the odd one out? (a) leave fridge door open (b) leave the TV on standby (c) run fans in empty rooms (d) use LED lamps
9. 9.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
10. 10.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
11. 11.True or false: to close the fridge quickly saves electricity. (a) True (b) False
12. 12.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
13. 13.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) use daylight to read (d) use old filament bulbs
14. 14.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
15. 15.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
16. 16.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) run fans in empty rooms (d) close the fridge quickly
17. 17.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) leave fridge door open (d) set the AC to 24 °C
18. 18.True or false: to use daylight to read saves electricity. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) switch off empty rooms (d) unplug idle chargers
20. 20.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
21. 21.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
22. 22.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
23. 23.Which of these wastes electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) unplug idle chargers (d) use daylight to read
24. 24.🔍 Which is the odd one out? (a) use daylight to read (b) use old filament bulbs (c) run fans in empty rooms (d) leave the TV on standby
25. 25.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.True or false: to unplug idle chargers saves electricity. (a) False (b) True
27. 27.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these wastes electricity? (a) unplug idle chargers (b) switch off empty rooms (c) leave fridge door open (d) use LED lamps
29. 29.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
30. 30.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
31. 31.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
33. 33.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 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?
35. 35.True or false: to switch off empty rooms saves electricity. (a) True (b) False
36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) unplug idle chargers (c) use LED lamps (d) switch off empty rooms
37. 37.True or false: to use old filament bulbs saves electricity. (a) True (b) False
38. 38.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
39. 39.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) unplug idle chargers (b) iron one shirt at a time (c) run fans in empty rooms (d) use old filament bulbs

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