Electricity
Electricity remains a critical and remarkable discovery as the widely used form of energy. Although electricity was discovered more than four hundred years ago, practical use has only existed since the mid-to-late 1800s (Rahman (2016). Evidently, people have understood the concept of electricity in different forms, including lightning but only idealized the concept in the latter days. Rahman (2016) defines electricity as the flow of electrons through a conductor. An electron refers to an isolated definite quantity of electricity in the form of a cathode ray. According to Hu (2005), the discovery of electrons happened in the 1890s through several independent experiments that resulted in the assignment of a negative charge e and mass m to the electron. Simply, electricity is defined as the flow of the electrons within a conductor, resulting in the establishment of an electric current.
Electric Current
Electric current denotes the rate at which electrons or charge flows. A large current can execute extensive capabilities such as start a truck compared to the flow used to operate a calculator, which requires lower currents. Electric current (I) can be derived as a ratio of charge (Q) passing a given area to the time spent (T). The SI unit, named after the French physicist Andr-Marie Ampre, of current, is ampere (A) (Weeks et al., 2005). Therefore, in representing the formula as I = Q / T. Based on the formula, it is proper to state that an ampere refers to one coulomb per second. To safeguard appliances from the possibility of excessive electric current, fuses or circuit breakers are used to protect appliances from excessive current. Fuses are categorized based on the desired amperes (amps), where only a tiny amount of current can pass based on the amperes.
Electric Charge
Electric charge refers to the physical property of matter, which triggers its ability to experience an electric or magnetic field. Despite possession of magnitude and direction, it is a scalar quantity and can be measured in coulombs. An electric field establishes a magnetic field. The combination of the two magnetic and electric fields is defined as electromagnetism. Electric charge can be categorized into two, direct and alternating current. Direct current refers to the flow of charge in one direction, while alternating current denotes a charge flow that periodically reverses directions. Substances can be classified as either conductors or non-conductors based on their ability or ease of permitting the movement of charge. Coulomb’s law is used in measuring electric charge. Further, the electric charge measurement can be achieved by calculating the electric current where 1 ampere = 1 A = 1 C/s (C representing coulomb while S represents second). Interpretively, a coulomb equals the product of electric current and time (A*s).
Resistance (series/parallel)
Resistance refers to the opposition of an electric flow in a substance. The SI unit of resistance is ohm denoted by the symbol depends on the conductor material and dimension. Resistance is inversely proportional to the cross-sectional area but directly proportional to the length. This explains why long cables must have a thick surface area to reduce resistance. Substances whose resistance equals zero are identified as insulators or non-conductors since it means the substances are restrictive of electricity flow (Nahvi & Edminister, 2018). Resistors can be organized either parallel or serially to achieve the desired level of resistance. The current supplied by the source depends on the equivalent resistance in the circuit. Equivalent resistance varies on the individual values of the resistors and their connection. In a series circuit, the output value of one resistor flows into the input of the second. Hence, the current permitted remains the same.
On the contrary, the current allowed through the parallel connection remains different. Therefore, each resistor has its potential drop. Resistances play a critical role in limiting current, dividing current, and lowering the voltage level. Resistance (R) = 1/G (Where I is current while G is the conductance of conductor (mho = reciprocal of ohms ())
Capacitance (series/parallel)
A capacitor is an energy storage element. It can store electrical pressure within specified periods. A charged capacitor is achieved through the flow of electric current for a period and discharged by flowing the same current in the opposite direction of the capacitor. Capacitors are composed of a pair of parallel conducting plates and separated by an insulating material identified as a dielectric (Nahvi & Edminister, 2018). The charge accumulated within the capacitor remains directly proportional to the applied voltage (Q V) derivatively, Q = CV where C is a constant identified as capacitance whose SI unit is Farad and Q is the charge on either plate. Therefore, C=Q (Coulombs)/V (Volts). Considering that Farad is a huge unit, microfarads are often used; 1 Farad = 106 F. When capacitors are connected in parallel, the total capacitance becomes the summation of the individual capacitors. In contrast, in the serial connection, the total capacitance becomes less than the individual capacitor’s capacitance. The formula for parallel capacitance = C1 + C2 + C3 + Cn while in the series total capacitance = 1/ (1/C1+1/C2+1/Cn)
Conductance
Conductance refers to the ability of a material to permit the flow of current. It is a measure of how easily current can flow in the materials or substance. It is the reciprocal of resistance and is measured in Siemens (S). Therefore, conductance = 1/resistance. The ability of a material to conduct electricity depends on different factors, including the type, size, and form. Considering the relationship between conductance and resistance, a material that exhibits a high level of conductance affects a low resistance property and vice versa.
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