Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 37 · 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.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an oil lamp (d) an LED lamp
2. 2.🔍 Which is the odd one out? (a) use LED lamps (b) use daylight to read (c) iron one shirt at a time (d) set the AC to 24 °C
3. 3.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
5. 5.True or false: to unplug idle chargers saves electricity. (a) False (b) True
6. 6.🧾 A 1500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
7. 7.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
8. 8.Which of these wastes electricity? (a) close the fridge quickly (b) set the AC to 24 °C (c) use daylight to read (d) use old filament bulbs
9. 9.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
10. 10.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
11. 11.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
12. 12.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
13. 13.True or false: to use daylight to read wastes electricity. (a) True (b) False
14. 14.🧾 A family uses 190 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
15. 15.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
16. 16.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) leave fridge door open (d) leave the TV on standby
17. 17.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
18. 18.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 watt (d) 1 volt
19. 19.Which of these wastes electricity? (a) use daylight to read (b) unplug idle chargers (c) switch off empty rooms (d) leave the TV on standby
20. 20.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) iron one shirt at a time
21. 21.🔍 Which is the odd one out? (a) leave fridge door open (b) use LED lamps (c) use daylight to read (d) set the AC to 24 °C
22. 22.🧾 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?
23. 23.🧾 A family uses 120 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
24. 24.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) use old filament bulbs (c) unplug idle chargers (d) leave the TV on standby
26. 26.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) run fans in empty rooms (d) leave the TV on standby
27. 27.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
28. 28.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) close the fridge quickly (d) iron one shirt at a time
29. 29.🧾 A 50 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
30. 30.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
31. 31.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
32. 32.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
33. 33.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
34. 34.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
35. 35.🧾 A family uses 80 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
36. 36.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
37. 37.Which of these saves electricity? (a) close the fridge quickly (b) iron one shirt at a time (c) run fans in empty rooms (d) leave fridge door open
38. 38.True or false: to iron one shirt at a time wastes electricity. (a) False (b) True
39. 39.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
40. 40.True or false: to iron one shirt at a time saves electricity. (a) True (b) False

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