Center of gravity

1. Definition of the center of gravity A rigid body is composed of many particles, therefore the gravitational force acting on each of these particles. In other words, each particle has its own weight. The center of gravity of an object is a point on the object where the weight of all parts of the …

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Equilibrium of a rigid body

Article about the Equilibrium of a rigid body 1. First condition Newton’s Second Law states that if the resultant force on an object (an object considered as a single particle) is not zero then the object will move with constant acceleration, where the direction of the object’s motion = the direction of the total force. …

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Hooke’s law

1. Hooke’s law for springs If the spring is pulled to the right, the spring will stretch and increase in length (figure 1). If the pull force is not very large, it is found that the increase in spring length (Δx) is proportional to the magnitude of the pull force (F). In other words, the …

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Ohm’s law

Definition of Ohm’s law In almost all metal conductors, the electric field is proportional to the density of the electric current, where the ratio of the electric field to the electrical current density is constant. Mathematically expressed through the equation: ρ = E / J E = electric field, ρ = resistivity, J = current …

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Resistivity

Article about Resistivity On the topic of electric current, the density of electric current has been discussed, so also the electric field has been explained in-topic about the electric field. The electric field and electric current are in a conductor if there is a potential difference in the conductor, whereas if there is no potential …

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Resistor color code

Article about the Resistor color code The resistor is one component of an electrical circuit that functions to control the number of electrical currents. In general, there are two types of resistors, namely wire coil resistors and carbon resistors. Wire roll resistors are usually used in the laboratory, made by wrapping fine wire on the …

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Resistors in series

Article about the Resistors in series If the resistors are connected as shown in the figure, the resistors are arranged in series. Resistor or electrical resistance in question can be in the form of resistor components, lights, or other electrical resistance. The electric charge moves through resistance 1 (R1) = the electric charge moves through …

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Electric resistance

Equation of the Electric resistance In the topic of Ohm’s law, a formula that states the relationship between the voltage (V), electric current (I), and electrical resistance (R) has been derived. Mathematically expressed through equations: This equation shows that the electrical resistance (R) is directly proportional to the electric voltage (V) and inversely proportional to …

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