Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 265 · 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.🧾 A family uses 70 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
2. 2.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) run fans in empty rooms (d) close the fridge quickly
3. 3.True or false: to switch off empty rooms saves electricity. (a) False (b) True
4. 4.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) unplug idle chargers (d) leave fridge door open
5. 5.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) an oil lamp (c) a filament bulb (d) a candle
6. 6.🧾 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?
7. 7.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
8. 8.🔍 Which is the odd one out? (a) leave the TV on standby (b) use LED lamps (c) set the AC to 24 °C (d) use daylight to read
9. 9.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
11. 11.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
12. 12.True or false: to close the fridge quickly saves electricity. (a) True (b) False
13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
14. 14.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
15. 15.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) unplug idle chargers (d) use old filament bulbs
16. 16.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
17. 17.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
18. 18.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use daylight to read (d) leave fridge door open
19. 19.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
20. 20.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
21. 21.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
22. 22.True or false: to use daylight to read wastes electricity. (a) False (b) True
23. 23.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) close the fridge quickly (d) unplug idle chargers
24. 24.🧾 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?
25. 25.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) leave the TV on standby (d) set the AC to 24 °C
27. 27.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use daylight to read (d) leave fridge door open
28. 28.True or false: to use old filament bulbs saves electricity. (a) True (b) False
29. 29.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
30. 30.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) use LED lamps (d) leave fridge door open
31. 31.True or false: to unplug idle chargers saves electricity. (a) True (b) False
32. 32.🧾 A family uses 160 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
33. 33.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
34. 34.Which of these wastes electricity? (a) use daylight to read (b) use old filament bulbs (c) close the fridge quickly (d) set the AC to 24 °C
35. 35.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) leave the TV on standby (d) close the fridge quickly
36. 36.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
37. 37.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) close the fridge quickly (d) leave fridge door open
38. 38.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
39. 39.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
40. 40.True or false: to unplug idle chargers wastes electricity. (a) False (b) True

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