Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 987 · 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.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
2. 2.🧾 A 500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
3. 3.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
5. 5.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) a candle (d) an oil lamp
6. 6.🔍 Which is the odd one out? (a) switch off empty rooms (b) close the fridge quickly (c) use daylight to read (d) leave the TV on standby
7. 7.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) iron one shirt at a time (d) set the AC to 24 °C
8. 8.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
9. 9.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
11. 11.🧾 A family uses 90 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
12. 12.True or false: to leave fridge door open saves electricity. (a) True (b) False
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
14. 14.Which of these wastes electricity? (a) use daylight to read (b) use old filament bulbs (c) switch off empty rooms (d) close the fridge quickly
15. 15.Which of these saves electricity? (a) run fans in empty rooms (b) switch off empty rooms (c) use old filament bulbs (d) iron one shirt at a time
16. 16.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
17. 17.True or false: to close the fridge quickly saves electricity. (a) False (b) True
18. 18.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) use old filament bulbs (d) leave fridge door open
19. 19.🔍 Which is the odd one out? (a) switch off empty rooms (b) use daylight to read (c) set the AC to 24 °C (d) iron one shirt at a time
20. 20.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave fridge door open (c) set the AC to 24 °C (d) use daylight to read
21. 21.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
22. 22.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
23. 23.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
24. 24.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) set the AC to 24 °C (d) leave the TV on standby
25. 25.Which of these saves electricity? (a) leave fridge door open (b) iron one shirt at a time (c) use LED lamps (d) leave the TV on standby
26. 26.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 watt (c) 1 ampere (d) 1 volt
27. 27.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
28. 28.True or false: to close the fridge quickly wastes electricity. (a) False (b) True
29. 29.Which of these wastes electricity? (a) use daylight to read (b) set the AC to 24 °C (c) use LED lamps (d) leave the TV on standby
30. 30.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) unplug idle chargers (d) iron one shirt at a time
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 3 hours. How many watt-hours (Wh) are saved?
33. 33.🧾 A family uses 50 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
34. 34.🧾 A 250 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
35. 35.🔍 Which is the odd one out? (a) leave the TV on standby (b) leave fridge door open (c) use LED lamps (d) use old filament bulbs
36. 36.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) use old filament bulbs (d) run fans in empty rooms
37. 37.True or false: to use daylight to read wastes electricity. (a) True (b) False
38. 38.🔍 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) use daylight to read
39. 39.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
40. 40.🧾 A family uses 170 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?

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