Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 399 · 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 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
2. 2.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
3. 3.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
4. 4.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use old filament bulbs (c) switch off empty rooms (d) run fans in empty rooms
5. 5.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
6. 6.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
7. 7.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) unplug idle chargers
8. 8.True or false: to unplug idle chargers saves electricity. (a) False (b) True
9. 9.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) set the AC to 24 °C
10. 10.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
11. 11.🔍 Which is the odd one out? (a) iron one shirt at a time (b) set the AC to 24 °C (c) use daylight to read (d) unplug idle chargers
12. 12.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
13. 13.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
14. 14.Which of these saves electricity? (a) run fans in empty rooms (b) iron one shirt at a time (c) unplug idle chargers (d) use old filament bulbs
15. 15.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
16. 16.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
17. 17.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
18. 18.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
20. 20.True or false: to use daylight to read saves electricity. (a) True (b) False
21. 21.True or false: to leave fridge door open saves electricity. (a) False (b) True
22. 22.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 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?
25. 25.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
26. 26.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) leave the TV on standby (d) close the fridge quickly
27. 27.True or false: to close the fridge quickly saves electricity. (a) False (b) True
28. 28.Which of these saves electricity? (a) switch off empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) run fans in empty rooms
29. 29.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
31. 31.Which of these wastes electricity? (a) run fans in empty rooms (b) unplug idle chargers (c) close the fridge quickly (d) set the AC to 24 °C
32. 32.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
33. 33.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
34. 34.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
35. 35.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) close the fridge quickly
36. 36.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
38. 38.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
39. 39.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) unplug idle chargers (d) set the AC to 24 °C
40. 40.True or false: to use LED lamps wastes electricity. (a) False (b) True

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