Science-Electromagnets Flashcards
What is an electromagnet?
An electromagnet is a piece of iron that becomes a temporary magnet when electricity flows through coils of insulated wire wrapped around it.
What is electromagnetism?
Electromagnetism is a property of electric and magnetic fields that causes interactions with electric charges and currents.
What is a coil in the context of electromagnets?
A coil is a series of loops made from insulated wire that is wound around a core to create an electromagnet.
What is a core in an electromagnet?
The core is the material (often iron or steel) around which a coil of insulated wire is wound. It becomes magnetized when electricity flows through the coil.
What is a rivet used for in building an electromagnet?
A rivet is a piece of iron or steel around which a coil is wound to create the electromagnet.
What is a temporary magnet?
A temporary magnet is a piece of iron that behaves like a magnet only when it is surrounded by a magnetic field, such as when an electric current is flowing through a coil.
How can you turn a steel rivet into a magnet that turns on and off?
By wrapping insulated wire around the steel rivet and running electricity through the wire, it becomes a temporary magnet that can be turned on and off using a switch.
What materials are needed to build an electromagnet in the lesson?
Materials needed include a circuit board, rivet, 150 cm wire, 30 cm wire, circuit base, switch, a cup of small washers, and a D-cell battery.
What is the role of the switch in the electromagnet circuit?
The switch controls the flow of electricity, turning the electromagnet on and off.
Why is Earth considered a magnet?
Earth is considered a magnet because it has a magnetic north pole and a magnetic south pole. The Earth’s magnetic field affects compasses and magnetic materials.
What is the function of a compass?
A compass is a free-spinning small permanent magnet used to detect Earth’s magnetic poles and other magnetic fields.
What happens to a steel rivet when electricity flows through a coil wrapped around it?
The steel rivet becomes an induced magnet, temporarily magnetized due to the electricity flowing through the coil.
What are the components of an electromagnet?
The main components are the coil (wire), core (usually iron or steel), and the power source (such as a battery).
What is the purpose of the wire in building an electromagnet?
The wire conducts electricity, creating the magnetic field when wrapped around the core.
