Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 129 · 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 is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) use old filament bulbs (d) set the AC to 24 °C
2. 2.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
3. 3.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) switch off empty rooms (d) leave the TV on standby
4. 4.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
5. 5.True or false: to use LED lamps wastes electricity. (a) True (b) False
6. 6.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
7. 7.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
8. 8.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) use old filament bulbs (d) use LED lamps
9. 9.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
10. 10.True or false: to use daylight to read saves electricity. (a) True (b) False
11. 11.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
12. 12.True or false: to leave fridge door open wastes electricity. (a) False (b) True
13. 13.Which of these wastes electricity? (a) leave fridge door open (b) use daylight to read (c) set the AC to 24 °C (d) unplug idle chargers
14. 14.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
15. 15.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
17. 17.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
18. 18.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
19. 19.🧾 A family uses 150 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
20. 20.True or false: to leave fridge door open saves electricity. (a) True (b) False
21. 21.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) leave fridge door open (d) close the fridge quickly
22. 22.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
23. 23.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
24. 24.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) run fans in empty rooms (d) use LED lamps
26. 26.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
27. 27.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
28. 28.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) switch off empty rooms (d) use LED lamps
29. 29.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
30. 30.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs
31. 31.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use LED lamps (d) run fans in empty rooms
32. 32.🔍 Which is the odd one out? (a) leave the TV on standby (b) unplug idle chargers (c) use LED lamps (d) use daylight to read
33. 33.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
35. 35.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
36. 36.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
37. 37.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
38. 38.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A family uses 120 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
40. 40.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?

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