Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 967 · 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 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
2. 2.Which of these wastes electricity? (a) set the AC to 24 °C (b) switch off empty rooms (c) close the fridge quickly (d) leave the TV on standby
3. 3.Which of these wastes electricity? (a) use LED lamps (b) switch off empty rooms (c) run fans in empty rooms (d) use daylight to read
4. 4.🔍 Which is the odd one out? (a) use daylight to read (b) leave fridge door open (c) run fans in empty rooms (d) use old filament bulbs
5. 5.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.Which of these saves electricity? (a) leave fridge door open (b) close the fridge quickly (c) use old filament bulbs (d) iron one shirt at a time
7. 7.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an oil lamp (c) an LED lamp (d) a candle
8. 8.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
9. 9.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
10. 10.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
11. 11.🔍 Which is the odd one out? (a) use LED lamps (b) run fans in empty rooms (c) leave the TV on standby (d) use old filament bulbs
12. 12.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
13. 13.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
14. 14.True or false: to use daylight to read saves electricity. (a) False (b) True
15. 15.🔍 Which is the odd one out? (a) close the fridge quickly (b) leave the TV on standby (c) use daylight to read (d) set the AC to 24 °C
16. 16.🔍 Which is the odd one out? (a) unplug idle chargers (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
17. 17.🧾 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?
18. 18.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
19. 19.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
20. 20.True or false: to use old filament bulbs saves electricity. (a) True (b) False
21. 21.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
22. 22.Which of these saves electricity? (a) use LED lamps (b) use old filament bulbs (c) leave the TV on standby (d) leave fridge door open
23. 23.Which of these saves electricity? (a) use old filament bulbs (b) leave fridge door open (c) switch off empty rooms (d) iron one shirt at a time
24. 24.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
25. 25.🔍 Which is the odd one out? (a) use LED lamps (b) close the fridge quickly (c) unplug idle chargers (d) run fans in empty rooms
26. 26.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
27. 27.🧾 A family uses 120 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
28. 28.Which of these wastes electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) unplug idle chargers (d) use LED lamps
29. 29.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
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 9 hours. How many watt-hours (Wh) are saved?
33. 33.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
34. 34.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
36. 36.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
37. 37.🧾 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?
38. 38.🧾 A 250 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity

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