Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 321 · 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 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 watt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
3. 3.🔍 Which is the odd one out? (a) leave fridge door open (b) unplug idle chargers (c) use old filament bulbs (d) leave the TV on standby
4. 4.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
5. 5.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
6. 6.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) close the fridge quickly (d) iron one shirt at a time
7. 7.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) close the fridge quickly (d) leave the TV on standby
8. 8.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) close the fridge quickly (d) use daylight to read
9. 9.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
11. 11.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
13. 13.True or false: to use daylight to read wastes electricity. (a) False (b) True
14. 14.🧾 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?
15. 15.True or false: to leave fridge door open saves electricity. (a) False (b) True
16. 16.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) set the AC to 24 °C (d) use daylight to read
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 4 hours. How many watt-hours (Wh) are saved?
18. 18.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
19. 19.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use daylight to read (d) use old filament bulbs
20. 20.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
21. 21.True or false: to leave the TV on standby saves electricity. (a) True (b) False
22. 22.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) leave the TV on standby (d) set the AC to 24 °C
23. 23.True or false: to use old filament bulbs saves electricity. (a) False (b) True
24. 24.🧾 A family uses 50 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
25. 25.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
26. 26.🧾 A family uses 40 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
27. 27.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
28. 28.True or false: to close the fridge quickly saves electricity. (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use old filament bulbs (d) use daylight to read
30. 30.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) set the AC to 24 °C (d) leave fridge door open
31. 31.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) use old filament bulbs (d) use LED lamps
32. 32.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
33. 33.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
34. 34.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
35. 35.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
36. 36.Which of these saves electricity? (a) run fans in empty rooms (b) use daylight to read (c) iron one shirt at a time (d) leave fridge door open
37. 37.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
38. 38.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
39. 39.🧾 A family uses 30 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.Which of these wastes electricity? (a) switch off empty rooms (b) use daylight to read (c) run fans in empty rooms (d) close the fridge quickly

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