Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 997 · 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) a candle (c) an oil lamp (d) a filament bulb
2. 2.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
3. 3.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) use LED lamps
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
5. 5.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
6. 6.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
7. 7.True or false: to use daylight to read saves electricity. (a) True (b) False
8. 8.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
9. 9.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
10. 10.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
11. 11.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use daylight to read (d) unplug idle chargers
12. 12.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
13. 13.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
14. 14.🧾 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?
15. 15.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
16. 16.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
18. 18.🧾 A family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
19. 19.Which of these wastes electricity? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave fridge door open (d) switch off empty rooms
20. 20.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
21. 21.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) switch off empty rooms
25. 25.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
26. 26.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
27. 27.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
28. 28.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
29. 29.True or false: to use daylight to read wastes electricity. (a) False (b) True
30. 30.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) run fans in empty rooms (d) leave fridge door open
31. 31.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
32. 32.True or false: to leave fridge door open wastes electricity. (a) False (b) True
33. 33.True or false: to leave the TV on standby saves electricity. (a) True (b) False
34. 34.🧾 A family uses 110 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
35. 35.🔍 Which is the odd one out? (a) leave fridge door open (b) switch off empty rooms (c) use LED lamps (d) unplug idle chargers
36. 36.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) use old filament bulbs (d) set the AC to 24 °C
37. 37.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) use daylight to read
39. 39.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?

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