Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 722 · 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 6 hours. How many units (kWh) of electricity does it use? =
2. 2.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) run fans in empty rooms (d) close the fridge quickly
3. 3.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 volt (d) 1 ampere
4. 4.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
5. 5.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
6. 6.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A family uses 130 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
8. 8.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
9. 9.True or false: to use old filament bulbs saves electricity. (a) False (b) True
10. 10.True or false: to leave fridge door open saves electricity. (a) True (b) False
11. 11.🔍 Which is the odd one out? (a) leave fridge door open (b) set the AC to 24 °C (c) use LED lamps (d) use daylight to read
12. 12.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) leave the TV on standby (d) use daylight to read
13. 13.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
14. 14.Which of these saves electricity? (a) switch off empty rooms (b) run fans in empty rooms (c) leave fridge door open (d) leave the TV on standby
15. 15.🧾 A family uses 20 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
16. 16.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) leave the TV on standby (d) set the AC to 24 °C
18. 18.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
19. 19.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
20. 20.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
21. 21.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
22. 22.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
24. 24.🧾 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?
25. 25.🧾 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?
26. 26.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
27. 27.🧾 A family uses 100 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
28. 28.🧾 A 100 W filament bulb is swapped for a 15 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 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
30. 30.Which of these wastes electricity? (a) unplug idle chargers (b) use daylight to read (c) use old filament bulbs (d) close the fridge quickly
31. 31.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use daylight to read (c) use old filament bulbs (d) leave the TV on standby
34. 34.🧾 A 100 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
35. 35.Which of these saves electricity? (a) leave fridge door open (b) run fans in empty rooms (c) unplug idle chargers (d) use old filament bulbs
36. 36.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) switch off empty rooms (d) leave fridge door open
37. 37.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) use LED lamps (d) leave the TV on standby
38. 38.🧾 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?
39. 39.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open

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