Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 822 · 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 close the fridge quickly? (a) saves electricity (b) wastes electricity
2. 2.True or false: to unplug idle chargers saves electricity. (a) True (b) False
3. 3.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
4. 4.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
5. 5.🧾 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
6. 6.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
7. 7.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
8. 8.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
9. 9.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
10. 10.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
11. 11.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
12. 12.True or false: to use old filament bulbs saves electricity. (a) True (b) False
13. 13.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) iron one shirt at a time (d) leave the TV on standby
14. 14.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
15. 15.🔍 Which is the odd one out? (a) use old filament bulbs (b) use LED lamps (c) iron one shirt at a time (d) leave the TV on standby
16. 16.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
17. 17.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
18. 18.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
19. 19.🧾 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?
20. 20.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) leave the TV on standby (d) use LED lamps
21. 21.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
23. 23.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
24. 24.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) leave fridge door open (d) set the AC to 24 °C
25. 25.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
27. 27.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) switch off empty rooms (d) leave the TV on standby
29. 29.🧾 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?
30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
31. 31.🧾 A family uses 140 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
32. 32.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) use old filament bulbs (d) unplug idle chargers
33. 33.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.True or false: to leave the TV on standby saves electricity. (a) False (b) True
36. 36.🔍 Which is the odd one out? (a) run fans in empty rooms (b) set the AC to 24 °C (c) use daylight to read (d) close the fridge quickly
37. 37.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave fridge door open (d) run fans in empty rooms
38. 38.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
39. 39.🧾 A family uses 140 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use LED lamps (d) iron one shirt at a time

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