Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 391 · 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 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
3. 3.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
4. 4.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
5. 5.🧾 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?
6. 6.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
7. 7.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
9. 9.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
10. 10.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
11. 11.🔍 Which is the odd one out? (a) use daylight to read (b) close the fridge quickly (c) unplug idle chargers (d) leave the TV on standby
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
13. 13.True or false: to leave fridge door open saves electricity. (a) True (b) False
14. 14.Which of these wastes electricity? (a) leave the TV on standby (b) close the fridge quickly (c) use LED lamps (d) switch off empty rooms
15. 15.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
16. 16.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave fridge door open (c) unplug idle chargers (d) use LED lamps
17. 17.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use old filament bulbs (c) use daylight to read (d) unplug idle chargers
18. 18.True or false: to unplug idle chargers saves electricity. (a) False (b) True
19. 19.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
20. 20.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
21. 21.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) run fans in empty rooms (d) leave the TV on standby
23. 23.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) an LED lamp (d) a filament bulb
25. 25.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
26. 26.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
27. 27.🧾 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?
28. 28.True or false: to use LED lamps saves electricity. (a) True (b) False
29. 29.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
30. 30.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) use old filament bulbs (d) leave the TV on standby
31. 31.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
33. 33.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave fridge door open (c) run fans in empty rooms (d) use daylight to read
34. 34.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
35. 35.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
36. 36.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
38. 38.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) unplug idle chargers (d) close the fridge quickly
39. 39.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
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?

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids