Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 994 · 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 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)
2. 2.🧾 A family uses 110 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
3. 3.💡 Does it save or waste electricity to use LED lamps? (a) wastes electricity (b) saves electricity
4. 4.💡 Does it save or waste electricity to unplug idle chargers? (a) saves electricity (b) wastes electricity
5. 5.🧾 A 250 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
6. 6.🔍 Which is the odd one out? (a) run fans in empty rooms (b) close the fridge quickly (c) switch off empty rooms (d) use daylight to read
7. 7.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
8. 8.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) unplug idle chargers (d) use LED lamps
9. 9.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
10. 10.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
11. 11.Which of these wastes electricity? (a) use LED lamps (b) set the AC to 24 °C (c) leave the TV on standby (d) switch off empty rooms
12. 12.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) run fans in empty rooms (d) unplug idle chargers
13. 13.🔍 Which is the odd one out? (a) iron one shirt at a time (b) use LED lamps (c) leave the TV on standby (d) leave fridge door open
14. 14.💡 Does it save or waste electricity to run fans in empty rooms? (a) saves electricity (b) wastes electricity
15. 15.🔍 Which is the odd one out? (a) run fans in empty rooms (b) use old filament bulbs (c) set the AC to 24 °C (d) leave the TV on standby
16. 16.🧾 A family uses 70 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
17. 17.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
18. 18.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
19. 19.🧾 A family uses 60 units of electricity in a month and each unit costs ₹8. What is the bill (in ₹)?
20. 20.💡 Does it save or waste electricity to switch off empty rooms? (a) saves electricity (b) wastes electricity
21. 21.🧾 A 50 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
22. 22.🔍 Which is the odd one out? (a) use daylight to read (b) unplug idle chargers (c) close the fridge quickly (d) iron one shirt at a time
23. 23.🧾 A family uses 160 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
24. 24.True or false: to leave the TV on standby wastes electricity. (a) False (b) True
25. 25.🧾 A 2000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
26. 26.True or false: to unplug idle chargers wastes electricity. (a) False (b) True
27. 27.True or false: to leave fridge door open saves electricity. (a) True (b) False
28. 28.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
29. 29.Which of these saves electricity? (a) use LED lamps (b) run fans in empty rooms (c) leave fridge door open (d) use old filament bulbs
30. 30.🧾 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?
31. 31.💡 Does it save or waste electricity to iron one shirt at a time? (a) saves electricity (b) wastes electricity
32. 32.True or false: to use daylight to read wastes electricity. (a) False (b) True
33. 33.💡 Does it save or waste electricity to close the fridge quickly? (a) wastes electricity (b) saves electricity
34. 34.🧾 A 40 W filament bulb is swapped for a 6 W LED lamp that gives about the same light. Both would run for 7 hours. How many watt-hours (Wh) are saved?
35. 35.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
36. 36.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
37. 37.🧾 A family uses 50 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
39. 39.True or false: to leave the TV on standby saves electricity. (a) False (b) True
40. 40.🧾 A 40 W filament bulb is swapped for a 6 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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