Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 862 · 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.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
3. 3.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) run fans in empty rooms (d) use LED lamps
4. 4.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
5. 5.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave fridge door open (c) set the AC to 24 °C (d) use LED lamps
6. 6.Which of these wastes electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) use daylight to read (d) unplug idle chargers
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) iron one shirt at a time
8. 8.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.🔍 Which is the odd one out? (a) leave fridge door open (b) run fans in empty rooms (c) leave the TV on standby (d) switch off empty rooms
11. 11.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
12. 12.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
13. 13.True or false: to unplug idle chargers saves electricity. (a) False (b) True
14. 14.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
15. 15.🧾 A family uses 110 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
16. 16.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.🧾 A family uses 30 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
18. 18.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) leave fridge door open (d) set the AC to 24 °C
19. 19.🔍 Which is the odd one out? (a) use daylight to read (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
20. 20.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
21. 21.🧾 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?
22. 22.Which of these wastes electricity? (a) close the fridge quickly (b) leave fridge door open (c) switch off empty rooms (d) use daylight to read
23. 23.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
24. 24.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
26. 26.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A family uses 170 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
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 2 hours. How many watt-hours (Wh) are saved?
32. 32.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
33. 33.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
34. 34.Which of these saves electricity? (a) run fans in empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) leave the TV on standby
35. 35.True or false: to use daylight to read saves electricity. (a) True (b) False
36. 36.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
37. 37.🔍 Which is the odd one out? (a) switch off empty rooms (b) set the AC to 24 °C (c) leave the TV on standby (d) use LED lamps
38. 38.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) unplug idle chargers (d) iron one shirt at a time
39. 39.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
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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