Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 344 · 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 family uses 70 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
2. 2.True or false: to close the fridge quickly saves electricity. (a) True (b) False
3. 3.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
4. 4.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
5. 5.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 volt (c) 1 ampere (d) 1 kilowatt-hour (kWh)
7. 7.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
8. 8.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
9. 9.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
10. 10.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
11. 11.True or false: to leave fridge door open saves electricity. (a) True (b) False
12. 12.Which of these wastes electricity? (a) use LED lamps (b) use daylight to read (c) iron one shirt at a time (d) switch off empty rooms
13. 13.🧾 A 100 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
14. 14.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) use old filament bulbs (d) leave fridge door open
15. 15.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
16. 16.Which of these wastes electricity? (a) close the fridge quickly (b) unplug idle chargers (c) run fans in empty rooms (d) use daylight to read
17. 17.🧾 A family uses 170 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
19. 19.True or false: to unplug idle chargers saves electricity. (a) False (b) True
20. 20.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use daylight to read (d) run fans in empty rooms
21. 21.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) an oil lamp (d) a candle
22. 22.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
23. 23.🧾 A family uses 170 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
24. 24.🧾 A 2000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
25. 25.Which of these saves electricity? (a) leave fridge door open (b) use old filament bulbs (c) run fans in empty rooms (d) close the fridge quickly
26. 26.🧾 A family uses 140 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
27. 27.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
28. 28.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
29. 29.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A family uses 100 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.🧾 A 500 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
32. 32.Which of these saves electricity? (a) leave the TV on standby (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
33. 33.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) leave fridge door open (d) use daylight to read
34. 34.🧾 A 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 50 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
36. 36.🔍 Which is the odd one out? (a) switch off empty rooms (b) iron one shirt at a time (c) leave the TV on standby (d) leave fridge door open
37. 37.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
38. 38.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
39. 39.True or false: to use daylight to read wastes electricity. (a) False (b) True
40. 40.Which of these wastes electricity? (a) close the fridge quickly (b) use old filament bulbs (c) use LED lamps (d) switch off empty rooms

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