Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 792 · 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 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
2. 2.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) leave the TV on standby (d) iron one shirt at a time
3. 3.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
4. 4.🧾 A family uses 190 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
5. 5.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 volt
7. 7.Which of these saves electricity? (a) unplug idle chargers (b) leave fridge door open (c) leave the TV on standby (d) use old filament bulbs
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
9. 9.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) use LED lamps (d) set the AC to 24 °C
11. 11.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
12. 12.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) run fans in empty rooms
13. 13.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
14. 14.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
16. 16.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
17. 17.True or false: to use daylight to read saves electricity. (a) True (b) False
18. 18.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) set the AC to 24 °C (d) iron one shirt at a time
19. 19.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
20. 20.🧾 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?
21. 21.🧾 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?
22. 22.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 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?
24. 24.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) use old filament bulbs (d) use daylight to read
25. 25.Which of these saves electricity? (a) use daylight to read (b) run fans in empty rooms (c) use old filament bulbs (d) leave fridge door open
26. 26.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use LED lamps (d) run fans in empty rooms
27. 27.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
29. 29.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
30. 30.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) leave the TV on standby (d) unplug idle chargers
31. 31.🧾 A family uses 160 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
32. 32.True or false: to leave the TV on standby wastes electricity. (a) True (b) False
33. 33.True or false: to leave fridge door open saves electricity. (a) False (b) True
34. 34.Which of these saves electricity? (a) use LED lamps (b) iron one shirt at a time (c) leave the TV on standby (d) leave fridge door open
35. 35.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.🧾 A family uses 40 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
37. 37.Which of these wastes electricity? (a) use old filament bulbs (b) use LED lamps (c) switch off empty rooms (d) set the AC to 24 °C
38. 38.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
39. 39.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) set the AC to 24 °C (d) iron one shirt at a time

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