Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 982 · 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 1000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
2. 2.🧾 A family uses 160 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
3. 3.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
4. 4.Which of these saves electricity? (a) leave fridge door open (b) leave the TV on standby (c) use old filament bulbs (d) switch off empty rooms
5. 5.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 watt (d) 1 volt
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) unplug idle chargers (d) iron one shirt at a time
7. 7.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
8. 8.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
9. 9.🧾 Which lamp gives the same light for the least power? (a) a candle (b) a filament bulb (c) an LED lamp (d) an oil lamp
10. 10.True or false: to use daylight to read saves electricity. (a) False (b) True
11. 11.Which of these saves electricity? (a) close the fridge quickly (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
12. 12.Which of these wastes electricity? (a) leave fridge door open (b) use daylight to read (c) unplug idle chargers (d) switch off empty rooms
13. 13.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
14. 14.🔍 Which is the odd one out? (a) run fans in empty rooms (b) iron one shirt at a time (c) leave fridge door open (d) close the fridge quickly
15. 15.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) use LED lamps (d) unplug idle chargers
16. 16.🔍 Which is the odd one out? (a) use daylight to read (b) set the AC to 24 °C (c) leave fridge door open (d) switch off empty rooms
17. 17.🧾 A 1500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
18. 18.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
19. 19.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
20. 20.🧾 A family uses 60 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
21. 21.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
22. 22.🧾 A family uses 190 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
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 1 hour. How many watt-hours (Wh) are saved?
24. 24.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
25. 25.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
26. 26.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) leave the TV on standby (d) close the fridge quickly
27. 27.Which of these saves electricity? (a) set the AC to 24 °C (b) iron one shirt at a time (c) leave the TV on standby (d) run fans in empty rooms
28. 28.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
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 9 hours. How many watt-hours (Wh) are saved?
30. 30.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) leave the TV on standby (d) run fans in empty rooms
31. 31.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
32. 32.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
33. 33.🔍 Which is the odd one out? (a) use LED lamps (b) leave the TV on standby (c) unplug idle chargers (d) use daylight to read
34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
35. 35.Which of these saves electricity? (a) iron one shirt at a time (b) use daylight to read (c) leave the TV on standby (d) leave fridge door open
36. 36.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?
37. 37.Which of these saves electricity? (a) run fans in empty rooms (b) leave fridge door open (c) use LED lamps (d) iron one shirt at a time
38. 38.Which of these wastes electricity? (a) iron one shirt at a time (b) switch off empty rooms (c) close the fridge quickly (d) use LED lamps
39. 39.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
40. 40.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =

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