Uses of Electromagnets

By Alice Ash and Hannah Kibblewhite Davenport

Contents

Slide 1 - Introduction- Electromagnets Slide 2 – Electric bells Slide 3 – Electric lockSlide 4 – loud speaker

Introduction

An electromagnet is when a wire carrying an electric current generates a magnetic field around it. The stronger the current the stronger the magnetic field.

Uses of an Electromagnet- electric bell

Uses of an electromagnet- Electric lock

• A magnetic lock is a simple locking device that consists of an electromagnet and armature plate. By attaching the electromagnet to the door frame and the armature plate to the door, a current passing through the electromagnet attracts the armature plate holding the door shut. Unlike an electric strike a magnetic lock has no interconnecting parts and is therefore not suitable for high security applications because it is possible to bypass the lock by disrupting the power supply. Nevertheless, the strength of today's magnetic locks compares well with that of conventional door locks and they cost less than conventional light bulbs to operate.

• (from Wikipedia)

Uses of an electromagnet- loud speaker

Uses of electromagnets - televisions

Televisions use electromagnets to direct the electron beam on the screen.

Uses of electromagnets-MRI scans

The most important use of the electromagnet in hospitals is in magnetic resonance imaging, commonly known as the MRI. It is used for getting a detailed image of the inside of the body, which helps diagnose a number of diseases. MRI can be used for diagnosis of brain tumours, bleeding, nerve injury and stroke injury. MRI can also detect if the heart or lungs are damaged. It can be used for diagnosis of breast and lung cancer. To find problems of the arteries and veins, MRI is used to look at the blood vessels. It can also be used to check problems for bones and joints, such as arthritis and bone marrow problems. It can also check the disc and nerves of the spines for spinal stenosis and spinal tumours.