Electrical Concepts and Wave Properties Explained
Electric Field
The electric field is the area of space around a load where electrical forces exert attraction or repulsion.
- The field strength depends on the load generator.
- The greater the load, the stronger the field.
- The further we move from the load generator, the weaker the field.
Capacitors
Capacitors store energy until required for use. They consist of two conductors, one positive and one negative, that support more capacity induction.
Ammeter
An ammeter measures the current in a circuit. It is placed
Read MoreMagnetic Fields: Properties and Laws
The Magnetic Field
The magnetic field is a region of space in which a point electric charge, value q, moving at a speed, suffers from a force that is perpendicular and proportional to the speed and the field, called magnetic induction or density magnetic flux.
Performance of Magnetic Field Lines
The performance of magnetic field lines can roughly estimate the magnetic field existing at a given point, taking into account the following characteristics:
- The magnetic field lines are always closed loops
Physics Lab Practices: Reaction Time, Density, Energy, Pendulums, Inertia, and Oscillation
Practice 1: Random Errors, Determination of Reaction Time
We know that the fall of a body is accelerated motion, with a relationship between the distance traveled and time. So, it is possible to determine the time it takes to react to stimuli, trying to catch a falling body by measuring the area it runs through before catching it.
- Medium-haul space: The sum of all measures / number of measures +/- error.
- Absolute error: Given by the measurement equipment.
- Relative error: |Δe| / |e|.
- Random error: (1
Understanding the Universe: Celestial Bodies and Energy
Geocentric System
The geocentric system is a planetary model which states that the Earth is the center of the Universe, and the other planets and the Sun revolve around it.
Heliocentric System
The heliocentric system is a planetary model where the Sun is the center of our system, and the other planets, including Earth, revolve around it.
Astrophysics
Astrophysics is the branch of astronomy that studies the structure, composition, and evolution of the Universe.
Light-Year
A light-year is the distance that
Read MoreEssential Vocabulary: Definitions and Terms
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- Abacus: A wooden box with ten parallel wires and ten beads on each wire, used to learn to count.
- Abbot (Abbess f.): The superior of a monastery or abbey.
- Abdicate: To renounce power (e.g., the king abdicated).
- Abolish: To remove a law (e.g., the law was abolished).
- Aboriginal: A primitive inhabitant of a country. / Native: A plant or animal from its original place of residence.
- Absolve: To leave a defendant guilt-free (e.g., the prisoner was acquitted).
- Greedy: Wanting something with great force; thirsty
Fundamental Laws of Physics: Motion, Energy, and Electricity
Newton’s Laws of Motion
Newton’s First Law of Motion
An object continues to remain at rest or in a state of uniform motion along a straight line unless an external unbalanced force acts on it.
Newton’s Second Law of Motion
The rate of change of momentum is proportional to the applied force, and the change of momentum occurs in the direction of the force.
Newton’s Third Law of Motion
Every action force has an equal and opposite reaction force which acts simultaneously.
Work
Work done by a force acting on
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