Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 791 · 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) iron one shirt at a time (c) leave fridge door open (d) run fans in empty rooms
3. 3.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
4. 4.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use LED lamps (c) run fans in empty rooms (d) switch off empty rooms
5. 5.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
6. 6.Which of these wastes electricity? (a) leave fridge door open (b) switch off empty rooms (c) set the AC to 24 °C (d) unplug idle chargers
7. 7.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
8. 8.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) unplug idle chargers (d) run fans in empty rooms
9. 9.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) a candle (d) an oil lamp
10. 10.🔍 Which is the odd one out? (a) close the fridge quickly (b) use daylight to read (c) leave the TV on standby (d) switch off empty rooms
11. 11.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) close the fridge quickly (d) use daylight to read
12. 12.Which of these wastes electricity? (a) unplug idle chargers (b) use LED lamps (c) close the fridge quickly (d) use old filament bulbs
13. 13.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) switch off empty rooms (d) leave fridge door open
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) leave fridge door open
16. 16.True or false: to leave the TV on standby saves electricity. (a) True (b) False
17. 17.True or false: to use daylight to read saves electricity. (a) False (b) True
18. 18.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
19. 19.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
20. 20.🧾 A family uses 170 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
21. 21.Which of these wastes electricity? (a) close the fridge quickly (b) use LED lamps (c) unplug idle chargers (d) run fans in empty rooms
22. 22.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
23. 23.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
24. 24.🔍 Which is the odd one out? (a) use daylight to read (b) switch off empty rooms (c) set the AC to 24 °C (d) leave fridge door open
25. 25.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
26. 26.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
27. 27.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) use daylight to read (c) switch off empty rooms (d) use old filament bulbs
28. 28.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) run fans in empty rooms (d) set the AC to 24 °C
29. 29.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) run fans in empty rooms (d) leave fridge door open
30. 30.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
31. 31.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
32. 32.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
33. 33.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
35. 35.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
36. 36.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
37. 37.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
38. 38.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
39. 39.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity

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