Section 6 - Movement from Electricity
... When a wire carrying a current is placed in a magnetic field, a force acts on it. The direction of this force depends on the direction of the current and on the direction of the magnetic field. If either is reversed, the direction of the force is reversed. When the field and the current are at right ...
... When a wire carrying a current is placed in a magnetic field, a force acts on it. The direction of this force depends on the direction of the current and on the direction of the magnetic field. If either is reversed, the direction of the force is reversed. When the field and the current are at right ...
Electricity and Magnetism
... When a current flows through the electromagnet, a magnetic field is produced in the coil Changing the direction of the current causes the coil in the electric motor of keep rotating Rotation speed of electric motors can be controlled ...
... When a current flows through the electromagnet, a magnetic field is produced in the coil Changing the direction of the current causes the coil in the electric motor of keep rotating Rotation speed of electric motors can be controlled ...
intro electromagnetism
... Groups of atoms join so that their magnetic fields are all going in the same direction These areas of atoms are called “domains” ...
... Groups of atoms join so that their magnetic fields are all going in the same direction These areas of atoms are called “domains” ...
8J Summary Sheet
... Pressure is the amount of force pushing on a certain area. For a certain area, the bigger the force, the bigger the pressure. For a certain force, the bigger the area, the smaller the pressure. In this picture, the thumb is putting a force onto the head of the pin. The force is transferred to the po ...
... Pressure is the amount of force pushing on a certain area. For a certain area, the bigger the force, the bigger the pressure. For a certain force, the bigger the area, the smaller the pressure. In this picture, the thumb is putting a force onto the head of the pin. The force is transferred to the po ...
Electromagnet
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of a large number of closely spaced turns of wire that create the magnetic field. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.Electromagnets are widely used as components of other electrical devices, such as motors, generators, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment. Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.