Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 600 · 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 is the odd one out? (a) use LED lamps (b) set the AC to 24 °C (c) switch off empty rooms (d) leave fridge door open
2. 2.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
3. 3.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
4. 4.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
5. 5.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) use LED lamps
6. 6.Which of these wastes electricity? (a) iron one shirt at a time (b) use daylight to read (c) use LED lamps (d) switch off empty rooms
7. 7.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
8. 8.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
10. 10.True or false: to close the fridge quickly saves electricity. (a) True (b) False
11. 11.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 ampere
13. 13.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) switch off empty rooms
14. 14.Which of these saves electricity? (a) leave the TV on standby (b) unplug idle chargers (c) iron one shirt at a time (d) use old filament bulbs
15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) switch off empty rooms (d) leave the TV on standby
16. 16.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
18. 18.True or false: to leave the TV on standby saves electricity. (a) True (b) False
19. 19.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
21. 21.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) leave the TV on standby (d) use daylight to read
22. 22.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
23. 23.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
24. 24.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
25. 25.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) iron one shirt at a time (d) set the AC to 24 °C
26. 26.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
27. 27.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
28. 28.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
29. 29.🔍 Which is the odd one out? (a) use old filament bulbs (b) unplug idle chargers (c) set the AC to 24 °C (d) use LED lamps
30. 30.True or false: to use daylight to read saves electricity. (a) True (b) False
31. 31.Which of these wastes electricity? (a) unplug idle chargers (b) leave the TV on standby (c) switch off empty rooms (d) use LED lamps
32. 32.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
33. 33.🔍 Which is the odd one out? (a) unplug idle chargers (b) close the fridge quickly (c) iron one shirt at a time (d) use daylight to read
34. 34.🧾 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?
35. 35.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
36. 36.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
37. 37.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
38. 38.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.🧾 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?
40. 40.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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