Umair Gaines
Electrical parameters are measurable electrical values or phenomena that characterise the behaviour of electronic circuits, components, or semiconductors. They are key characteristics such as frequency, voltage, and resistance that must be matched between a power generator and the electric grid to ensure safe and efficient connection, operation, and synchronization. Electrical parameters are important in various fields, including electrical engineering, elevator maintenance, and clinical electrophysiological tests. For example, in the case of elevators, electrical parameters such as amps, volts, and ohms are fundamental for technicians to work on design, manufacturing, diagnostics, and repair.
| Characteristics | Values |
|---|---|
| Electrical parameters | Volt, Ampere, Ohm |
| Electric performance | Resistance, Inductance, Capacitance |
| Ohm's Law | Correlation between electric current (I), voltage (V), and resistance (R) in a conductor |
| Ampacity | Amount of current a conductor can handle before temperature limits are exceeded |
| Electromotive force (EMF) | Electrical force that causes electrons to move or flow |
| Potential difference (PD) | Difference in potential |
| Voltage source | Two-terminal device with constant voltage at any instant |
| Practical voltage sources | Sources with internal resistance that cause voltage drop and terminal voltage reduction |
| Resistance | Ratio of voltage across a body to the current through it |
| Conductance | Reciprocal of resistance |
| Resistivity | Electrical resistance per unit length and per unit of cross-sectional area at a specified temperature |
| Conductivity | Ability to conduct electricity through a given material |
| Non-linear resistor | Type of resistor where current changes with applied voltage or temperature |
| Fixed resistor | Resistor with a specific value |
| Variable resistor | Resistor with a changeable value |
| Frequency | Must be matched between a power generator and electric grid for safe and efficient connection |
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What You'll Learn
Frequency
In electrical current, frequency is the number of times a sine wave repeats or completes a positive-to-negative cycle in a second. The more cycles that occur per second, the higher the frequency. For instance, an alternating current with a frequency of 3 Hz will have a waveform that repeats three times in one second.
Circuits and equipment are designed to operate at a fixed or variable frequency. If equipment designed for a specific frequency is operated at a different frequency, it will perform abnormally. For example, an AC motor designed to operate at 60 Hz will run slower if the frequency drops below 60 Hz and faster if it exceeds this number.
The frequency of power grids varies by nation. In large parts of the world, the frequency is 50 Hz, but in the Americas and parts of Asia, it is typically 60 Hz. Japan is an exception, with a frequency of 50 Hz or 60 Hz depending on the region. In the US, the power grid is based on a highly stable 60-hertz signal, and household electrical power is based on a single-phase, 120-volt AC power supply.
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Voltage
In a direct current (dc) circuit, such as a battery, closing the switch activates the voltage in the power source, creating pressure that forces electrons to flow as a current out of the battery's negative terminal. Alternating current (ac) voltage, on the other hand, flows in evenly undulating waves and reverses direction at regular intervals. AC voltage is more common than DC voltage and is typically delivered to homes and businesses, with the primary voltage supply varying by nation. For example, the primary voltage supply in the United States is 120 volts.
It's important to note that voltage can be associated with either the source of energy or the loss, dissipation, or storage of energy. When measuring voltage, one must specify the points across which the voltage is being measured, and a voltmeter is used to measure the voltage between two points in a system.
Understanding voltage is crucial in electronics as it is one of the basic building blocks required to manipulate and utilize electricity effectively.
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Current
Electrical parameters refer to the measurable electrical values or phenomena that characterise the behaviour of electronic circuits, components, or semiconductors. One such parameter is current, which is also known as amperage and is measured using a device called an ammeter. Electric currents create magnetic fields, which are used in motors, generators, inductors, and transformers.
A flow of positive charges gives the same electric current and has the same effect in a circuit as an equal flow of negative charges in the opposite direction. Current in gases and liquids generally consists of a flow of positive ions in one direction and a flow of negative ions in the opposite direction. The direction of the current is usually taken to be that of the positive charge carrier. A current of negative charges moving in the opposite direction is equivalent to a positive charge of the same magnitude moving in the conventional direction.
Direct current (DC) refers to current and voltage that do not change direction. A typical example is the electricity provided by dry cells and lithium-ion batteries used in cars. With direct current, the voltage is always positive or negative, and the current always flows in the same direction. Alternating current (AC) refers to current and voltage whose direction and magnitude vary regularly over time. AC current waveforms include sine waves, square waves, sawtooth waves, and triangular waves. AC electricity is used by the power grid, but most standard electronic devices convert it into DC current for use with their internal circuitry.
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Resistance
Electrical parameters refer to the measurable values and phenomena that characterise the behaviour of electronic circuits, components, or semiconductors. One such parameter is resistance, which is the measure of opposition to electric current. Resistance is measured in ohms, represented by the symbol Ω (an upper-case Greek omega).
The German physicist Georg Simon Ohm (1787-1854) was the first to demonstrate that the current in a metal wire is directly proportional to the voltage applied. This relationship is known as Ohm's law, which states that the voltage (E) across a circuit is equal to the current (I) flowing through it multiplied by the resistance (R). In other words, volts = amps x ohms.
Technicians often determine resistance by taking voltage and current measurements and applying Ohm's law. If the resistance is unknown, the formula can be rearranged to R = E/I (ohms = volts / amps). Resistance can be measured using a multimeter or an ohmmeter. A multimeter is a multifunctional tool that can measure voltage, current, resistance, and other electrical parameters, while an ohmmeter only measures resistance.
Measuring resistance can help identify electrical problems and determine the condition of a component or circuit. High resistance can indicate issues such as damaged conductors due to burning or corrosion, while low resistance can be caused by damaged insulators or moisture.
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Amps
Electrical parameters refer to measurable electrical values or phenomena that characterise the behaviour of electronic circuits, components, or semiconductors. These parameters are key characteristics such as frequency, which must be matched between a power generator and the electric grid to ensure a safe and efficient connection. One such electrical parameter is the ampere, or amp, which is the unit of electric current in the International System of Units (SI).
The ampere is named after French mathematician and physicist André-Marie Ampère (1775-1836), who is considered a father of electromagnetism. In recognition of Ampère's contributions to the creation of modern electrical science, the ampere was established as a standard unit of electrical measurement for electric current at the 1881 International Exposition of Electricity. The ampere was originally defined as one-tenth of the unit of electric current in the centimetre-gram-second system of units. That unit, now known as the abampere, was defined as the amount of current that generates a force of two dynes per centimetre of length between two wires one centimetre apart.
The ampere can be alternatively expressed in terms of other units using the relationship I = P/V, and thus 1 A = 1 W/V. The ampere is that constant current that, if maintained in two straight parallel conductors of infinite length, negligible circular cross-section, and placed one metre apart in a vacuum, would produce between these conductors a force equal to 2×10^−7 newtons per metre of length. Ampère's force law states that there is an attractive or repulsive force between two parallel wires carrying an electric current. This force is used in the formal definition of the ampere.
Amperage is the strength of that electric current, expressed in amps. The larger the amperage, the more electricity can flow through the circuit. Amperage is the "rate" at which current is flowing through the circuit or the number of electrons moving through the wire. Amperage can be measured by a multimeter, a device that can measure electrical voltage, current, and resistance. It can also be measured by a tool called an "ammeter" or "ampere meter", which measures the electric current in amps.
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