How can you use a magnet to induce an electric current in a coil of wire?
A coil of wire with an electric current flowing through it becomes a magnet. Putting iron inside a current-carrying coil greatly increases the strength of the electromagnet. Changing magnetic fields induce electric currents in copper and other conductors.
One way of generating a current is to move a magnet into or out of a coil. This movement causes a voltage to be induced across the ends of the coil. Instead, generators induce a current by spinning a coil of wire inside a magnetic field, or by spinning a magnet inside a coil of wire.
- Magnetic currents flow from one side of the coil to the other passing in the hole and creating a magnetic field. If iron is inside the coil the magnetic field is stronger. When the current flows in the coil,"MAGNETIC EIELD" will produce,simple.
- If a magnet is stored away from power lines, other magnets, high temperatures, and other factors that adversely affect the magnet, it will retain its magnetism essentially forever. Modern magnet materials do lose a very small fraction of their magnetism over time.
- Magnets can make electricity. A magnetic field pulls and pushes electrons in some objects near them to make them move. Metals, like copper, have electrons that are moved easily and can be readily moved from their orbits. If a magnet is moved quickly through a coil of copper wire, electrons move and electricity is made.
Magnet and coil. The voltage is induced, and so the current is generated, only when the magnet and the wire (coil) move relative to each other. This is because a conductor must cut across magnetic field lines for a voltage to be induced.
- What is created when a wire moves between the poles of a magnet? A compass needle responds to the magnetic field around a current because the compass needle is a what? An electric current. When a magnet moves through a coil of wire or when a wire moves between the poles of a magnet, what is created?
- A coil of wire with an electric current flowing through it becomes a magnet. Putting iron inside a current-carrying coil greatly increases the strength of the electromagnet. Changing magnetic fields induce electric currents in copper and other conductors.
- Electromotive Force and Internal Resistance. The electromotive force (e) or e.m.f. is the energy provided by a cell or battery per coulomb of charge passing through it, it is measured in volts (V). It is equal to the potential difference across the terminals of the cell when no current is flowing.
This current flows because something is producing an electric field that forces the charges around the wire. (It cannot be the magnetic force since the charges are not initially moving). A changing magnetic field through a coil of wire therefore must induce an emf in the coil which in turn causes current to flow.
- For a closed surface, the sum of magnetic flux is always equal to zero (Gauss' law for magnetism). No matter how small the volume, the magnetic sources are always dipole sources (like miniature bar magnets), so that there are as many magnetic field lines coming in (to the south pole) as out (from the north pole).
- It contains a set of electrical conductors wound in coils over an iron core. The rotor generates a moving magnetic field around the stator, which induces a voltage difference between the windings of the stator. This produces the alternating current (AC) output of the generator.
- Magnets are used to generate an electric current. It is often easier to generate an electric current by moving a wire inside a magnetic field. Whether it is the magnet or the wire that moves, the effect is the same. Current is generated as long as the wire crosses the magnetic field lines.
Updated: 2nd October 2019