P15 Flashcards
What is attraction?
Opposite poles will experience a force pulling them together
What is an alternator?
A device that makes use of the generator effect to generate alternating current.
Alternators are commonly used in vehicles to charge the battery and power electrical systems.
What happens between opposite poles of a magnet?
They will experience a force of attraction towards each other.
This attraction is a fundamental property of magnets.
What is generated around a wire when current flows through it?
A magnetic field is generated around it.
The strength of the field depends on the magnitude of the current and the distance from the wire.
What is a dynamo?
A device that makes use of the generator effect to generate direct current.
Dynamos are often used in older power generation systems.
What is an electric motor?
A current-carrying coil of wire in a magnetic field that experiences forces causing rotation.
Electric motors are essential in various applications, from household appliances to industrial machinery.
What is an electromagnet?
A solenoid with an iron core.
Electromagnets can be turned on and off, making them useful in many applications.
What does Fleming’s Left-Hand Rule determine?
The orientation of the force (thumb), current (second finger), and magnetic field (first finger).
This rule is used in the context of the motor effect.
What is the generator effect?
When there is relative motion between an electrical conductor and a magnetic field, a potential difference will be induced across the ends of the conductor.
A current will flow if this conductor is part of a complete circuit.
What is an induced magnet?
A material that becomes a magnet in an existing magnetic field but loses its magnetism quickly once removed.
Induced magnetism produces attractive forces.
What does a magnetic compass do?
It contains a small bar magnet that points in the direction of the Earth’s magnetic field.
Compasses are essential for navigation.
What are magnetic field lines?
Lines representing the strength and direction of a magnetic field.
The direction indicates where a force would act on another north pole placed at that point.
What is a magnetic field?
The region around a magnet where another magnet or magnetic material will experience a force.
The strength of the magnetic field decreases with distance from the magnet.
What materials are considered magnetic materials?
- Iron
- Steel
- Cobalt
- Nickel
These materials are attracted to magnets and can be magnetized.
What are magnetic poles?
The regions of a magnet where the magnetic forces are at their strongest.
Every magnet has a north and south pole.
What is a microphone?
A device that uses the generator effect to convert pressure variations of sound waves into variations in electrical current.
Microphones are widely used in audio recording and communication.
What is the motor effect?
When a current-carrying wire is placed in a magnetic field, a force will be experienced between the wire and the magnet.
This principle is the basis of electric motors.
What is a permanent magnet?
A magnet that produces its own magnetic field.
Permanent magnets are used in various applications, including fridge magnets and speakers.
What happens between like-poles of magnets?
They will experience a force of repulsion.
This repulsion is another fundamental property of magnets.
What is a solenoid?
A wire wrapped into the shape of a coil that has a strong and uniform magnetic field inside.
The magnetic field strength can be increased by adding an iron core.
What is a step-down transformer?
A transformer that has a smaller potential difference in the secondary coil than in the primary coil.
Step-down transformers are used to reduce voltage for safety and equipment compatibility.
What is a step-up transformer?
A transformer that has a larger potential difference in the secondary coil than in the primary coil.
Step-up transformers are used to increase voltage for efficient power transmission.
What is the unit of magnetic flux density?
Tesla.
The Tesla is a derived unit in the International System of Units (SI).
What is a transformer?
An iron core with a primary and secondary coil of wire wound around opposite ends.
Transformers are crucial for changing voltage levels in electrical systems.
