Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 684 · 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.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a candle (d) a filament bulb
2. 2.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) use daylight to read
3. 3.🧾 A family uses 130 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
4. 4.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
5. 5.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
6. 6.🔍 Which is the odd one out? (a) use daylight to read (b) use LED lamps (c) run fans in empty rooms (d) set the AC to 24 °C
7. 7.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) leave fridge door open (d) use old filament bulbs
8. 8.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
9. 9.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) use daylight to read (d) set the AC to 24 °C
10. 10.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
12. 12.🔍 Which is the odd one out? (a) use old filament bulbs (b) iron one shirt at a time (c) use daylight to read (d) run fans in empty rooms
13. 13.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) close the fridge quickly (d) switch off empty rooms
14. 14.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
15. 15.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
16. 16.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
17. 17.Which of these saves electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
18. 18.True or false: to use daylight to read saves electricity. (a) True (b) False
19. 19.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
21. 21.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
22. 22.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
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 3 hours. How many watt-hours (Wh) are saved?
24. 24.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
26. 26.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
27. 27.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
28. 28.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
29. 29.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave the TV on standby
30. 30.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
31. 31.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) unplug idle chargers (d) use LED lamps
33. 33.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
34. 34.🧾 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?
35. 35.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
36. 36.Which of these wastes electricity? (a) use daylight to read (b) use old filament bulbs (c) switch off empty rooms (d) close the fridge quickly
37. 37.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
38. 38.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
39. 39.True or false: to leave the TV on standby saves electricity. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) close the fridge quickly

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