Points to Remember

Points to Remember:

·           When current passes through a wire a magnetic field is set up around the wire. This effect of current is called magnetic effect of current.

·           The space surrounding a bar magnet in which its influence in the form of magnetic force can be detected, is called magnetic field.

·           The path along which a free magnetic north pole will move in a magnetic field is called magnetic field lines.

·           Magnetic field lines do not intersect.

·           The magnetic field set up by a current carrying conductor is always at right angles to the direction of flow of current.

·           Two parallel wires carrying current in the same directions attract each other.

·           Two parallel wires carrying current in the opposite directions repel each other.

·           Direction of the force in a current carrying conductor is determined by Fleming’s Le Hand Rule.

·           Electric motor is a device which converts electrical energy into mechanical energy.

·           The phenomenon of producing induced current in a closed circuit due to the change in magnetic field in the circuit is known as electromagnetic induction.

·           Direction of induced current in a conductor is determined by Fleming’s Right Hand Rule.

·           Electric generator is a device used to convert mechanical energy into electrical energy.

·           Electric generator works on the principle of electromagnetic induction.

·           Transformer is a device which converts low alternating current to high alternating current and vice versa.

·           Transformer transfers electric power from one circuit to another.