# How Does the Number of Coils Affect Voltage?

Learn how increasing number of coils affects voltage from an expert's perspective. Understand how electromagnetic coils work and how they generate magnetic fields.

The more turns of cable in the secondary coil, the higher the output voltage. This is because there are more turns that are cut off by the flow. Generally, a larger diameter coil with the same number of turns will produce the most tension due to its larger surface area and more flow passing through it. However, when it comes to a normal transformer, most of the flow will pass through a secondary coil that is either tightly or loosely wrapped around the core.

In technical terms, each coil of wire increases the magnetic flux density (force) of the magnet. It rolls up the lines of magnetic force so that they are parallel and point in the same direction. When this cable is wrapped around a core, such as a straight solenoid magnet, it reshapes and concentrates the direction of the field lines. An electrical current can be passed through the coil cable to generate a magnetic field or an external magnetic field that varies over time can generate an EMF (voltage) in the conductor.

A current that changes over time in one coil (the primary coil) creates a magnetic field that induces a voltage in the other coil (the secondary coil). A ferrite core coil is a type of coil with a core made from ferrite, a ferrimagnetic ceramic composite. An electromagnetic coil is an electrical conductor, such as a cable in the form of a coil (spiral or helix). Tight coils with many windings are used when capturing a very localized magnetic field, such as from a point source or through the yoke of a transformer.

The primary coil is connected to an electrical network and the core is opened so that one arm is vertical and the secondary one is simply an aluminum ring, as shown in the diagram. Voltage is applied to the primary coil which produces a changing magnetic field in the iron core. In another experiment, secondary coils have only five or six turns and their ends are joined together by two nails touching each other. Electromagnets are coils that generate a magnetic field for some external use, often to exert a mechanical force on something.

##### Imke van Smeets

Friendly music practitioner. Proud beer fan. Typical coffeeaholic. Friendly tv enthusiast. Amateur zombie guru.