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coil

Primary Information
Secondary Information

Definition

A coil is a spiral or helix-shaped object. It is made up of a single strand or multiple strands of wire that are wound around a core. The core can be made of a variety of materials, such as metal, plastic, or air.

Coils are used in a variety of applications, including electrical engineering, electronics, and physics. In electrical engineering, coils are used to create magnetic fields. These magnetic fields can be used to generate electricity, to power motors, and to store energy. In electronics, coils are used to filter out noise and amplify signals. In physics, coils are used to study the properties of matter and to measure the strength of magnetic fields.

The shape of a coil affects its properties. For example, a coil with a small diameter will have a stronger magnetic field than a coil with a large diameter. The number of turns in a coil also affects its properties. For example, a coil with more turns will have a stronger magnetic field than a coil with fewer turns.

Coils are an important part of many different devices. They are used in everything from refrigerators to cell phones to MRI machines.

Here are some of the key things to know about coils:

  • They are spiral or helix-shaped objects.
  • They are made up of a single strand or multiple strands of wire that are wound around a core.
  • The core can be made of a variety of materials, such as metal, plastic, or air.
  • They are used in a variety of applications, including electrical engineering, electronics, and physics.
  • The shape of a coil affects its properties.
  • They are an important part of many different devices.

How can the word be used?

The transformer had a coiled coil of wire inside it.

coil

Different forms of the word

Noun: coil (plural: coils).

Adjective: coiled.

Verb: to coil.

Etymology

The word coil comes from the Middle English word coilen, which means to wind or twist. The Middle English word coilen is thought to come from the Old English word cwelan, which also means to wind or twist.

Question

What objects contain a coil?

AQA Science Exam Question and Answer

Question:

What is a coil and what are some of its uses?

Answer:

A coil is a wire that is wound into a spiral shape. Coils are used in a variety of applications, including:

Inductors: Inductors are used to store electrical energy. They are used in electronic circuits to filter out noise and create oscillations.

Transformers: Transformers are used to step up or down the voltage of an electrical current. They are used in power grids to transmit electricity over long distances.

Speakers: Speakers use coils to convert electrical signals into sound waves. The coil is attached to a cone, which vibrates when an electrical current flows through the coil.

Magnetic fields: Coils can be used to create magnetic fields. This is done by passing an electrical current through the coil. The magnetic field around the coil is strongest at the centre of the coil.

Additional information:

The shape of a coil affects its properties. A coil with a larger diameter will have a stronger magnetic field than a coil with a smaller diameter. A coil with more turns will also have a stronger magnetic field than a coil with fewer turns.

The size and shape of a coil also affect its inductance. Inductance is the property of a coil that resists changes in current. A coil with a larger inductance will resist changes in current more than a coil with a smaller inductance.

The coil is a versatile device that can be used in a variety of applications. Its properties can be adjusted to meet the specific needs of a particular application.