Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 395 · 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 of these wastes electricity? (a) leave fridge door open (b) close the fridge quickly (c) unplug idle chargers (d) switch off empty rooms
2. 2.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
3. 3.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
4. 4.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
5. 5.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
6. 6.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
7. 7.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) leave fridge door open (d) switch off empty rooms
8. 8.True or false: to use LED lamps wastes electricity. (a) False (b) True
9. 9.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) use daylight to read (d) unplug idle chargers
10. 10.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an LED lamp (c) a filament bulb (d) an oil lamp
11. 11.🧾 A family uses 200 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
12. 12.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
13. 13.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) unplug idle chargers (d) leave fridge door open
14. 14.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) use daylight to read (d) run fans in empty rooms
15. 15.True or false: to close the fridge quickly saves electricity. (a) False (b) True
16. 16.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
17. 17.🧾 A 1500 W appliance runs for 4 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 wastes electricity? (a) use LED lamps (b) use daylight to read (c) iron one shirt at a time (d) set the AC to 24 °C
20. 20.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
21. 21.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
23. 23.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
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 9 hours. How many watt-hours (Wh) are saved?
25. 25.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
26. 26.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
27. 27.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
29. 29.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) iron one shirt at a time (d) use LED lamps
30. 30.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
32. 32.Which of these saves electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) use old filament bulbs (d) leave fridge door open
33. 33.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
34. 34.True or false: to switch off empty rooms saves electricity. (a) True (b) False
35. 35.🔍 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
36. 36.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
37. 37.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
38. 38.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) use daylight to read (d) use old filament bulbs
39. 39.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
40. 40.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?

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