These devices are called generators, alternators, magnetos, or dynamos. These devices produce electrical energy from mechanical energy. The opposite is a motor which produces mechanical energy from electrical energy.
All electric currents produce a magnetic field.
An electromagnet is a device design for the particular purpose. It uses electric current specifically to act as a magnet.
Many electric devices use a magnetic field as part of thier function. Even an electric motor creates an alternating magnetic field to do its work.
A simple electrical device that moves a metal plunger is a solenoid. A door be works like that.
A magnet made by passing electricity through a coil of wire is called an electromagnet. Just the coil of wire is not enough. You also need a coil the wire around a magnetizable metal such as iron or nickel to actually become magnetic.
An electromagnet or solenoid.
A conductor passing a direct current will produce a magnetic field around it.
The field can be intensified by wrapping the wire into a coil and further intensified by placing a steel core inside the coil.
An electric motor.
A compass.
A magnetometer is a device that is used to detect magnetic fields on the seafloor. It was invented by Sheldon Breiner.
ammeter
When we turn of the current in an electromagnet then electromagnet looses its magnetic property,provided the material used inside the current carrying solenoid is soft iron core. If, the material is steel then after the current is turned the magnetism propety still prevails and hence steel becomes a permanent magnet.
You can use a device that detects magnetism. A compass needle may suffice.
An electrical generator does that.
Any device with an electrical current will create a magnetic field. A tube of wire coils with a current running through it is called a solenoid and it will produce a magnetic field through the inside of the tube, as well as around it... Sorry, not much for physics.
That's how every electric generator works.
an electromagnet
magnet
Geiger Counter
The usual device is called a clamp meter, a device that clamps round one wire to mesure the current via the magnetic field.
A transformer is the device used to increase or decrease the voltage of alternating current (AC) This is done through a process referred to as inducing.It's operation is based on the fact that electricity produces a magnetic field around itself. By placing 2 coils of cable beside each other, the magnetic field of one coil will induce a voltage in the other coil.
inductor
generator
inductor
The idea is that the magnetic field of the device reacts with the external magnetic field. If the current is reversed, the magnetic field would also be reversed, and the reading would be the opposite.