Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 83 · 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.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 volt (c) 1 ampere (d) 1 watt
2. 2.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
3. 3.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
4. 4.Which of these wastes electricity? (a) leave the TV on standby (b) unplug idle chargers (c) switch off empty rooms (d) use LED lamps
5. 5.Which of these wastes electricity? (a) unplug idle chargers (b) leave fridge door open (c) use LED lamps (d) use daylight to read
6. 6.🧾 A family uses 20 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
7. 7.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
8. 8.True or false: to use old filament bulbs wastes electricity. (a) False (b) True
9. 9.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
10. 10.True or false: to switch off empty rooms saves electricity. (a) True (b) False
11. 11.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
13. 13.🧾 A 500 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
14. 14.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) set the AC to 24 °C (d) use daylight to read
15. 15.True or false: to leave the TV on standby saves electricity. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) run fans in empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) unplug idle chargers
17. 17.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
18. 18.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) a candle (c) an LED lamp (d) an oil lamp
20. 20.🧾 A 100 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
21. 21.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
22. 22.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
23. 23.🧾 A family uses 200 units of electricity in a month and each unit costs ₹6. 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.🧾 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?
26. 26.🔍 Which is the odd one out? (a) unplug idle chargers (b) run fans in empty rooms (c) switch off empty rooms (d) use LED lamps
27. 27.🧾 A family uses 80 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
28. 28.🔍 Which is the odd one out? (a) close the fridge quickly (b) run fans in empty rooms (c) iron one shirt at a time (d) leave the TV on standby
29. 29.🧾 A 250 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A family uses 170 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 10 hours. How many watt-hours (Wh) are saved?
32. 32.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use daylight to read (c) leave the TV on standby (d) leave fridge door open
33. 33.True or false: to use daylight to read saves electricity. (a) False (b) True
34. 34.🧾 A 60 W filament bulb is swapped for a 9 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
35. 35.Which of these wastes electricity? (a) use old filament bulbs (b) close the fridge quickly (c) use daylight to read (d) set the AC to 24 °C
36. 36.🧾 A 500 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 130 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
38. 38.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
39. 39.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
40. 40.🧾 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?

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