Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 761 · 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 4 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
3. 3.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
4. 4.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
5. 5.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) leave the TV on standby (d) use daylight to read
6. 6.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
7. 7.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
8. 8.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
9. 9.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
10. 10.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
11. 11.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
12. 12.Which of these saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) iron one shirt at a time (d) use LED lamps
13. 13.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) leave the TV on standby (d) iron one shirt at a time
14. 14.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
15. 15.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) unplug idle chargers (d) leave the TV on standby
16. 16.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
17. 17.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) iron one shirt at a time (d) run fans in empty rooms
18. 18.Which of these wastes electricity? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave the TV on standby (d) switch off empty rooms
19. 19.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) use daylight to read (d) leave fridge door open
20. 20.Which of these saves electricity? (a) iron one shirt at a time (b) run fans in empty rooms (c) leave fridge door open (d) set the AC to 24 °C
21. 21.True or false: to use daylight to read wastes electricity. (a) True (b) False
22. 22.🔍 Which is the odd one out? (a) iron one shirt at a time (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
23. 23.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms
24. 24.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
25. 25.True or false: to use old filament bulbs saves electricity. (a) True (b) False
26. 26.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
27. 27.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
28. 28.🧾 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?
29. 29.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A family uses 180 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
31. 31.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
32. 32.🧾 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?
33. 33.Which of these saves electricity? (a) leave the TV on standby (b) leave fridge door open (c) use daylight to read (d) use old filament bulbs
34. 34.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
35. 35.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) leave fridge door open (d) iron one shirt at a time
36. 36.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
37. 37.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
38. 38.Which of these wastes electricity? (a) use old filament bulbs (b) switch off empty rooms (c) close the fridge quickly (d) unplug idle chargers
39. 39.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
40. 40.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity

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