Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 776 · 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 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
2. 2.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) unplug idle chargers (d) set the AC to 24 °C
3. 3.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
4. 4.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 volt (d) 1 kilowatt-hour (kWh)
6. 6.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
7. 7.True or false: to leave the TV on standby saves electricity. (a) True (b) False
8. 8.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
9. 9.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
10. 10.True or false: to use LED lamps wastes electricity. (a) True (b) False
11. 11.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) close the fridge quickly
12. 12.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
13. 13.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) run fans in empty rooms (d) switch off empty rooms
15. 15.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
17. 17.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
18. 18.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) close the fridge quickly (d) unplug idle chargers
19. 19.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A family uses 60 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
21. 21.True or false: to use daylight to read wastes electricity. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) use daylight to read
23. 23.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
24. 24.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
25. 25.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 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?
29. 29.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
30. 30.True or false: to unplug idle chargers saves electricity. (a) True (b) False
31. 31.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) use daylight to read (d) leave fridge door open
32. 32.True or false: to use old filament bulbs saves electricity. (a) True (b) False
33. 33.True or false: to close the fridge quickly saves electricity. (a) True (b) False
34. 34.Which of these saves electricity? (a) unplug idle chargers (b) run fans in empty rooms (c) leave fridge door open (d) iron one shirt at a time
35. 35.True or false: to use daylight to read saves electricity. (a) True (b) False
36. 36.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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