Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 870 · 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 lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) a filament bulb (d) an LED lamp
3. 3.🧾 A family uses 140 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
4. 4.🔍 Which is the odd one out? (a) use old filament bulbs (b) close the fridge quickly (c) run fans in empty rooms (d) leave the TV on standby
5. 5.True or false: to use LED lamps saves electricity. (a) False (b) True
6. 6.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
7. 7.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
8. 8.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
9. 9.🧾 A 2000 W appliance runs for 8 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 9 hours. How many watt-hours (Wh) are saved?
11. 11.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
12. 12.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
13. 13.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave fridge door open (c) use old filament bulbs (d) switch off empty rooms
14. 14.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
15. 15.Which of these wastes electricity? (a) unplug idle chargers (b) close the fridge quickly (c) switch off empty rooms (d) run fans in empty rooms
16. 16.Which of these saves electricity? (a) set the AC to 24 °C (b) leave the TV on standby (c) leave fridge door open (d) use old filament bulbs
17. 17.True or false: to set the AC to 24 °C wastes electricity. (a) False (b) True
18. 18.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
19. 19.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) iron one shirt at a time (c) leave the TV on standby (d) leave fridge door open
20. 20.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
21. 21.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these wastes electricity? (a) close the fridge quickly (b) use daylight to read (c) unplug idle chargers (d) leave fridge door open
23. 23.🧾 A family uses 100 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
24. 24.Which of these wastes electricity? (a) set the AC to 24 °C (b) unplug idle chargers (c) use old filament bulbs (d) close the fridge quickly
25. 25.Which of these saves electricity? (a) run fans in empty rooms (b) leave the TV on standby (c) unplug idle chargers (d) leave fridge door open
26. 26.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
27. 27.🧾 A family uses 190 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
28. 28.🔍 Which is the odd one out? (a) leave the TV on standby (b) iron one shirt at a time (c) use daylight to read (d) use old filament bulbs
29. 29.🧾 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?
30. 30.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
31. 31.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
33. 33.🧾 A family uses 20 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
34. 34.🔍 Which is the odd one out? (a) iron one shirt at a time (b) switch off empty rooms (c) unplug idle chargers (d) use daylight to read
35. 35.Which of these wastes electricity? (a) set the AC to 24 °C (b) use LED lamps (c) iron one shirt at a time (d) use daylight to read
36. 36.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
37. 37.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
38. 38.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
39. 39.True or false: to run fans in empty rooms wastes electricity. (a) False (b) True
40. 40.🧾 A family uses 180 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?

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