Electronics Worksheet: Electricity Units

Electronics lesson 19: Electricity units and saving power · Set 426 · 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.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
2. 2.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 watt
3. 3.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
4. 4.💡 Does it save or waste electricity to iron one shirt at a time? (a) wastes electricity (b) saves electricity
5. 5.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
6. 6.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) leave the TV on standby (c) unplug idle chargers (d) use daylight to read
7. 7.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
8. 8.🧾 A family uses 30 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
9. 9.🧾 A 200 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
10. 10.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a candle (c) a filament bulb (d) an LED lamp
11. 11.True or false: to use daylight to read saves electricity. (a) True (b) False
12. 12.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave fridge door open (c) switch off empty rooms (d) use old filament bulbs
13. 13.🧾 A family uses 80 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
14. 14.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
15. 15.True or false: to set the AC to 24 °C saves electricity. (a) False (b) True
16. 16.Which of these saves electricity? (a) use old filament bulbs (b) iron one shirt at a time (c) unplug idle chargers (d) leave the TV on standby
17. 17.🧾 A family uses 50 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
18. 18.💡 Does it save or waste electricity to run fans in empty rooms? (a) wastes electricity (b) saves electricity
19. 19.💡 Does it save or waste electricity to close the fridge quickly? (a) saves electricity (b) wastes electricity
20. 20.🧾 A 2000 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
21. 21.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
22. 22.🔍 Which is the odd one out? (a) leave fridge door open (b) close the fridge quickly (c) use old filament bulbs (d) leave the TV on standby
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 2 hours. How many watt-hours (Wh) are saved?
24. 24.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
25. 25.🔍 Which is the odd one out? (a) switch off empty rooms (b) unplug idle chargers (c) use old filament bulbs (d) use daylight to read
26. 26.🧾 A family uses 20 units of electricity in a month and each unit costs ₹9. What is the bill (in ₹)?
27. 27.🧾 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?
28. 28.💡 Does it save or waste electricity to leave the TV on standby? (a) saves electricity (b) wastes electricity
29. 29.🧾 A 75 W filament bulb is swapped for a 12 W LED lamp that gives about the same light. Both would run for 8 hours. How many watt-hours (Wh) are saved?
30. 30.🧾 A 2000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
31. 31.True or false: to close the fridge quickly wastes electricity. (a) True (b) False
32. 32.Which of these saves electricity? (a) use old filament bulbs (b) run fans in empty rooms (c) iron one shirt at a time (d) close the fridge quickly
33. 33.🧾 A 1000 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
34. 34.True or false: to iron one shirt at a time wastes electricity. (a) True (b) False
35. 35.🔍 Which is the odd one out? (a) use old filament bulbs (b) use daylight to read (c) leave fridge door open (d) leave the TV on standby
36. 36.🧾 A 100 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
37. 37.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
38. 38.🧾 A family uses 200 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
39. 39.Which of these wastes electricity? (a) use daylight to read (b) close the fridge quickly (c) use LED lamps (d) iron one shirt at a time
40. 40.True or false: to use old filament bulbs saves electricity. (a) False (b) True

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