Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 202 · 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 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
2. 2.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
3. 3.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) use LED lamps
4. 4.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 ampere
5. 5.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
6. 6.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) switch off empty rooms (d) leave the TV on standby
7. 7.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
9. 9.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an oil lamp (d) an LED lamp
10. 10.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) iron one shirt at a time (d) leave fridge door open
11. 11.True or false: to run fans in empty rooms saves electricity. (a) True (b) False
12. 12.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
13. 13.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use daylight to read (d) leave the TV on standby
14. 14.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
15. 15.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
16. 16.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
17. 17.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
18. 18.Which of these wastes electricity? (a) switch off empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) use LED lamps
19. 19.Which of these saves electricity? (a) set the AC to 24 °C (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
20. 20.🧾 A family uses 50 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
21. 21.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) use daylight to read (d) iron one shirt at a time
23. 23.🔍 Which is the odd one out? (a) leave the TV on standby (b) set the AC to 24 °C (c) use LED lamps (d) close the fridge quickly
24. 24.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
25. 25.True or false: to use daylight to read wastes electricity. (a) True (b) False
26. 26.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) close the fridge quickly (b) use LED lamps (c) run fans in empty rooms (d) set the AC to 24 °C
28. 28.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
29. 29.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
31. 31.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
32. 32.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
33. 33.True or false: to run fans in empty rooms wastes electricity. (a) True (b) False
34. 34.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
35. 35.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
36. 36.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
37. 37.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) run fans in empty rooms (d) use daylight to read
38. 38.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
39. 39.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
40. 40.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =

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