Class X Science: Effects of Current – One-liner GK

Here is a set of 100 One-liner General Knowledge (GK) facts from Class X Science – Unit IV: Effects of Current covering:

11. Electric Current, Potential Difference & Ohm’s Law

12. Magnetic Effects of Electric Current



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Class X Science: Effects of Current – One-liner GK

100 important one-liner GK facts from Unit IV (Electric Current, Ohm’s Law, and Magnetic Effects), designed for Class X Science revision and quiz preparation.


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⚡ 100 One-liner GK – Effects of Current

1. Electric current is the flow of electric charge through a conductor.


2. The SI unit of electric current is ampere (A).


3. One ampere equals 1 coulomb of charge flowing per second.


4. A device used to measure current is called an ammeter.


5. Ammeter is always connected in series in a circuit.


6. Potential difference is the work done to move a unit charge between two points.


7. The SI unit of potential difference is volt (V).


8. A voltmeter measures potential difference and is connected in parallel.


9. Ohm’s law states that V = IR, where V is voltage, I is current, and R is resistance.


10. Resistance is the opposition offered by a material to the flow of current.


11. The SI unit of resistance is ohm (Ω).


12. A conductor obeys Ohm’s Law if the V-I graph is a straight line.


13. Resistance increases with the length of the conductor.


14. Resistance decreases with the thickness of the conductor.


15. Resistance depends on the material of the conductor.


16. The device used to change resistance is called a rheostat.


17. The combination of resistors in a single path is series connection.


18. In series, total resistance = R₁ + R₂ + R₃…


19. In parallel, total resistance is less than the least resistor.


20. Electrical energy = Power × Time.


21. Power = Voltage × Current (P = VI).


22. SI unit of electric power is watt (W).


23. 1 kilowatt = 1000 watts.


24. 1 kilowatt-hour (kWh) = 3.6 × 10⁶ joules.


25. Electrical fuse protects circuits from overcurrent.


26. Fuse wire is made of tin-lead alloy.


27. Magnetic field is the region where magnetic force is experienced.


28. Magnetic field lines always form closed loops.


29. Field lines emerge from north pole and enter south pole.


30. Strength of magnetic field is shown by closeness of field lines.


31. Magnetic field around a current-carrying conductor is circular.


32. Right-hand thumb rule gives the direction of magnetic field.


33. Current-carrying straight conductor produces circular field lines.


34. Magnetic field inside a current-carrying solenoid is uniform.


35. A solenoid behaves like a bar magnet.


36. Magnetic effect of current was discovered by Hans Christian Oersted.


37. An electromagnet consists of a soft iron core inside a solenoid.


38. The strength of an electromagnet depends on the current and number of turns.


39. Electric motor converts electrical energy into mechanical energy.


40. The principle of motor is based on magnetic force on a current-carrying conductor.


41. Fleming’s Left-Hand Rule gives the direction of force on the conductor.


42. Electric generator converts mechanical energy into electrical energy.


43. Fleming’s Right-Hand Rule is used in electric generators.


44. In electric motor, armature rotates between magnetic poles.


45. Split rings in motors ensure unidirectional current.


46. In generators, slip rings provide alternating current (AC).


47. Direct current (DC) flows in one direction only.


48. AC changes direction periodically.


49. The frequency of AC in India is 50 Hz.


50. AC is transmitted over long distances with less loss than DC.


51. Earth wire protects against electric shock.


52. Electric bell uses an electromagnet.


53. More coils in a solenoid increase the magnetic field strength.


54. A galvanometer detects small current in circuits.


55. Heating effect of current is used in electric heaters.


56. Resistance produces heat in a conductor (Joule’s law of heating).


57. Heat = I²Rt (Joule’s Law of Heating).


58. Copper has low resistance and is used in wiring.


59. Nichrome is used in heating devices.


60. Fuse wire melts when current exceeds safe limit.


61. MCBs are modern replacements for fuses.


62. A relay is an automatic switch using electromagnetism.


63. A transformer changes voltage using electromagnetic induction.


64. Core of a transformer is made of soft iron.


65. Magnetic field can deflect a compass needle.


66. Increasing current increases magnetic field strength.


67. Magnetic poles always exist in pairs.


68. Magnetic force is stronger near the poles.


69. Electromagnets are used in cranes to lift heavy iron objects.


70. Solenoids are used in magnetic locks.


71. Insulation in wires prevents short circuits.


72. Short circuit occurs when wires touch each other.


73. Overloading causes excessive current flow.


74. Household circuits use parallel connection.


75. Circuit breakers cut off supply during overload.


76. Transformer works only with alternating current.


77. A step-up transformer increases voltage.


78. A step-down transformer decreases voltage.


79. Loudspeakers use magnetic effects of current.


80. Electric trains run using electric motors.


81. Microwave ovens use electric current to generate heat.


82. A dry cell provides direct current.


83. Magnetic field has both direction and magnitude.


84. The deflection of compass shows magnetic field presence.


85. A solenoid with iron core forms a strong magnet.


86. Alternator is a type of generator for producing AC.


87. Dynamo is a generator producing DC.


88. Oersted’s experiment showed the magnetic field around wire.


89. Ammeter has very low resistance.


90. Voltmeter has very high resistance.


91. Rheostat varies current in the circuit.


92. Magnetic effects can be demonstrated with iron filings.


93. A bell rings by making and breaking contact with electromagnet.


94. Overuse of appliances can damage circuits.


95. Higher resistance wires produce more heat.


96. Compact fluorescent lamps (CFLs) save electricity.


97. Magnetic induction is used in wireless chargers.


98. Power stations generate electricity using turbines.


99. Solar cells convert light energy to electricity.


100. Proper earthing is essential for safety in electrical systems.




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