Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 82 · 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 family uses 200 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 kilowatt-hour (kWh) (b) 1 ampere (c) 1 volt (d) 1 watt
3. 3.🧾 A 200 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
4. 4.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
5. 5.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
6. 6.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 4 hours. How many watt-hours (Wh) are saved?
7. 7.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
8. 8.🔍 Which is the odd one out? (a) switch off empty rooms (b) use LED lamps (c) close the fridge quickly (d) leave fridge door open
9. 9.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 A 2000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
11. 11.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
12. 12.Which of these wastes electricity? (a) set the AC to 24 °C (b) use old filament bulbs (c) switch off empty rooms (d) use LED lamps
13. 13.🔍 Which is the odd one out? (a) leave the TV on standby (b) switch off empty rooms (c) iron one shirt at a time (d) leave fridge door open
14. 14.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
15. 15.🧾 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?
16. 16.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) switch off empty rooms (c) use daylight to read (d) iron one shirt at a time
17. 17.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
18. 18.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) use LED lamps (d) run fans in empty rooms
19. 19.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
20. 20.🔍 Which is the odd one out? (a) leave fridge door open (b) iron one shirt at a time (c) close the fridge quickly (d) use old filament bulbs
21. 21.🧾 A 50 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
22. 22.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) use LED lamps
23. 23.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) close the fridge quickly (c) leave the TV on standby (d) use LED lamps
24. 24.💡 Does it save or waste electricity to close the fridge quickly? (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 7 hours. How many watt-hours (Wh) are saved?
26. 26.🧾 A 100 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
27. 27.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
28. 28.🧾 Which lamp gives the same light for the least power? (a) a filament bulb (b) an LED lamp (c) an oil lamp (d) a candle
29. 29.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
30. 30.🧾 A family uses 130 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
31. 31.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) use old filament bulbs (d) run fans in empty rooms
32. 32.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
33. 33.🧾 A 250 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
35. 35.True or false: to close the fridge quickly saves electricity. (a) True (b) False
36. 36.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
37. 37.🔍 Which is the odd one out? (a) close the fridge quickly (b) unplug idle chargers (c) set the AC to 24 °C (d) use old filament bulbs
38. 38.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
39. 39.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) run fans in empty rooms (d) use old filament bulbs
40. 40.🧾 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?

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