Electromagnets and DC Motors

Front

What is an electromagnet?

Back

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. It consists of a coil of wire, often wrapped around a core made of ferromagnetic material.

Front

What role does the core play in an electromagnet?

Back

The core enhances the magnetic field created by the coil of wire when electric current flows through it, making the electromagnet stronger.

Front

What happens to an electromagnet when the electric current is turned off?

Back

When the electric current is turned off, the electromagnet loses its magnetism and becomes a non-magnetic material.

Front

How does the number of coils affect the strength of an electromagnet?

Back

The greater the number of coils wrapped around the core, the stronger the electromagnet becomes, as more current-carrying loops create a stronger magnetic field.

Front

What is the function of a DC motor?

Back

A DC motor converts electrical energy into mechanical energy using the interaction between a magnetic field and a current-carrying coil.

Front

What is the principle behind the operation of a DC motor?

Back

A DC motor operates on the principle that a current-carrying conductor placed in a magnetic field experiences a force, causing it to rotate.

Front

What is the significance of a closed switch in an electromagnet circuit?

Back

A closed switch allows electricity to flow through the circuit, enabling the electromagnet to function.

Front

What is the effect of increasing the current in an electromagnet?

Back

Increasing the current flowing through the coil of an electromagnet increases the strength of the magnetic field.

Front

What is the difference between a permanent magnet and an electromagnet?

Back

A permanent magnet produces a constant magnetic field without the need for electricity, while an electromagnet's magnetic field is temporary and depends on electric current.

Front

What is a relay and how does it relate to electromagnets?

Back

A relay is an electrically operated switch that uses an electromagnet to open or close a circuit.