Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 196 · 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.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
2. 2.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) an oil lamp (d) a filament bulb
3. 3.True or false: to leave fridge door open saves electricity. (a) False (b) True
4. 4.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
5. 5.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
6. 6.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
7. 7.True or false: to set the AC to 24 °C wastes 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.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use LED lamps (d) leave the TV on standby
11. 11.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
12. 12.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
13. 13.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) use LED lamps (d) run fans in empty rooms
14. 14.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) use LED lamps (d) leave the TV on standby
16. 16.Which of these wastes electricity? (a) leave the TV on standby (b) use daylight to read (c) close the fridge quickly (d) switch off empty rooms
17. 17.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
18. 18.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
19. 19.Which of these saves electricity? (a) use daylight to read (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
20. 20.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
21. 21.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
22. 22.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
23. 23.True or false: to use old filament bulbs saves electricity. (a) True (b) False
24. 24.True or false: to unplug idle chargers saves electricity. (a) True (b) False
25. 25.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
26. 26.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) leave the TV on standby (d) use LED lamps
27. 27.🧾 A family uses 130 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
28. 28.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
29. 29.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
30. 30.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) unplug idle chargers
31. 31.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
32. 32.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
33. 33.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
35. 35.Which of these saves electricity? (a) close the fridge quickly (b) use old filament bulbs (c) leave the TV on standby (d) iron one shirt at a time
36. 36.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
38. 38.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
39. 39.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
40. 40.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?

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