Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 433 · 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 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
2. 2.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
3. 3.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) close the fridge quickly
4. 4.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
5. 5.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
7. 7.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) use daylight to read (d) leave the TV on standby
8. 8.Which of these saves electricity? (a) leave fridge door open (b) switch off empty rooms (c) leave the TV on standby (d) use old filament bulbs
9. 9.Which of these saves electricity? (a) use old filament bulbs (b) use LED lamps (c) leave fridge door open (d) run fans in empty rooms
10. 10.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
11. 11.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
12. 12.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use old filament bulbs (d) close the fridge quickly
13. 13.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
14. 14.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
15. 15.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
16. 16.🔍 Which is the odd one out? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) unplug idle chargers
17. 17.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
18. 18.🔍 Which is the odd one out? (a) unplug idle chargers (b) switch off empty rooms (c) close the fridge quickly (d) leave fridge door open
19. 19.Which of these wastes electricity? (a) switch off empty rooms (b) use LED lamps (c) leave fridge door open (d) set the AC to 24 °C
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 1 hour. How many watt-hours (Wh) are saved?
21. 21.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.True or false: to leave fridge door open saves electricity. (a) True (b) False
23. 23.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
24. 24.Which of these saves electricity? (a) use daylight to read (b) run fans in empty rooms (c) iron one shirt at a time (d) leave fridge door open
25. 25.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A family uses 150 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
27. 27.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) use old filament bulbs (d) use LED lamps
28. 28.🧾 A 1500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
29. 29.True or false: to use daylight to read saves electricity. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) leave the TV on standby (d) use daylight to read
31. 31.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) close the fridge quickly (d) use old filament bulbs
32. 32.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
33. 33.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
34. 34.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
35. 35.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) iron one shirt at a time
37. 37.🧾 A 50 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
39. 39.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
40. 40.Which of these wastes electricity? (a) switch off empty rooms (b) iron one shirt at a time (c) close the fridge quickly (d) unplug idle chargers

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