Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 964 · 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 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
3. 3.🧾 A family uses 200 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
4. 4.True or false: to use daylight to read saves electricity. (a) True (b) False
5. 5.Which of these wastes electricity? (a) switch off empty rooms (b) unplug idle chargers (c) leave fridge door open (d) use LED lamps
6. 6.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use old filament bulbs (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 3 hours. How many watt-hours (Wh) are saved?
8. 8.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
9. 9.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
10. 10.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
11. 11.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
12. 12.True or false: to leave the TV on standby saves electricity. (a) True (b) False
13. 13.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
14. 14.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
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 1 hour. How many watt-hours (Wh) are saved?
16. 16.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 5 hours. How many watt-hours (Wh) are saved?
17. 17.🧾 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
18. 18.🧾 A family uses 40 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
19. 19.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
20. 20.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
21. 21.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) use LED lamps (d) leave fridge door open
22. 22.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
23. 23.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
24. 24.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) iron one shirt at a time (d) close the fridge quickly
25. 25.True or false: to leave fridge door open wastes electricity. (a) False (b) True
26. 26.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
29. 29.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
30. 30.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) leave the TV on standby (d) iron one shirt at a time
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 3 hours. How many watt-hours (Wh) are saved?
32. 32.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
33. 33.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) unplug idle chargers (d) use LED lamps
34. 34.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
35. 35.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) unplug idle chargers (d) use old filament bulbs
36. 36.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) iron one shirt at a time (d) use daylight to read
37. 37.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) switch off empty rooms (d) leave the TV on standby
38. 38.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) iron one shirt at a time (d) use old filament bulbs
39. 39.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
40. 40.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =

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