Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 571 · 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.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
3. 3.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
4. 4.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
5. 5.🧾 A family uses 30 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
6. 6.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
8. 8.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
9. 9.True or false: to use LED lamps saves electricity. (a) False (b) True
10. 10.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
11. 11.🧾 A 1500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
12. 12.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use old filament bulbs (d) switch off empty rooms
13. 13.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a candle (c) a filament bulb (d) an oil lamp
14. 14.True or false: to leave fridge door open saves electricity. (a) False (b) True
15. 15.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
16. 16.🧾 A 50 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
17. 17.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
18. 18.True or false: to leave the TV on standby saves electricity. (a) True (b) False
19. 19.🧾 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?
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 6 hours. How many watt-hours (Wh) are saved?
21. 21.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) iron one shirt at a time (d) unplug idle chargers
22. 22.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave fridge door open (c) iron one shirt at a time (d) leave the TV on standby
23. 23.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
24. 24.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
25. 25.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
26. 26.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
27. 27.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use LED lamps (c) use daylight to read (d) unplug idle chargers
28. 28.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) leave fridge door open (d) use old filament bulbs
29. 29.🧾 A family uses 150 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
30. 30.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
31. 31.🧾 A family uses 140 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
32. 32.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
33. 33.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
34. 34.🧾 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?
35. 35.🧾 A family uses 180 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
36. 36.🧾 A family uses 40 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
37. 37.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
38. 38.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
40. 40.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity

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