Electromagnets, Generators and 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 of ferromagnetic material, which becomes magnetized when current flows through the wire.

Front

What is the principle of a generator?

Back

A generator converts mechanical energy into electrical energy using electromagnetic induction. When a conductor moves through a magnetic field, an electric current is induced in the conductor.

Front

What is the function of a transformer?

Back

A transformer is a device that changes the voltage of alternating current (AC) in a circuit. It can step up (increase) or step down (decrease) voltage levels with minimal energy loss.

Front

What is the difference between AC and DC?

Back

AC (Alternating Current) is an electric current that reverses direction periodically, while DC (Direct Current) flows in one direction only. AC is commonly used for power distribution, while DC is used in batteries and electronic devices.

Front

What is a non-contact force?

Back

A non-contact force is a force that acts on an object without physical contact. Examples include gravitational force, magnetic force, and electrostatic force.

Front

What happens when two objects with the same charge are brought close together?

Back

When two objects with the same charge (either both positive or both negative) are brought close together, they repel each other due to the electrostatic force.

Front

What is static electricity?

Back

Static electricity is the accumulation of electric charge on the surface of objects, which can result from friction, leading to an imbalance of positive and negative charges.

Front

What is the role of electrons in electricity?

Back

Electrons are negatively charged particles that flow through conductors to create electric current. The movement of electrons is what constitutes electricity.

Front

What is the function of a motor?

Back

A motor is a device that converts electrical energy into mechanical energy. It works by using electromagnetic forces to create motion.

Front

What is electromagnetic induction?

Back

Electromagnetic induction is the process by which a changing magnetic field induces an electric current in a conductor. This principle is the basis for generators and transformers.