Wiktor Wise
Electrical terms and their meanings are important to understand, given that electricity is such a big part of our daily lives. Many household appliances such as refrigerators, washing machines, and dishwashers are powered by alternating current (AC), which is the current that enters our homes. Voltage, denoted by the letter U, is the potential difference between the receiving terminals in a closed circuit, and it comes in alternating and direct current varieties. Electrical abbreviations are used throughout several industries, including automotive, construction, and electronic device repair.
What does "IN" mean in electrical terms?
| Characteristics | Values |
|---|---|
| I | Unit of electric current |
| Insulation | Prevents electrical current from flowing where it shouldn't |
| In-phase | Two or more alternating quantities passing through a circuit with the same amount of time between corresponding values |
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Alternating Current (AC)
The usual waveform of AC in electric power circuits is a sine wave, with the positive and negative halves of the cycle corresponding to the direction of the current. AC voltage can be increased or decreased with a transformer, allowing efficient power transmission through power lines at high voltages, which is then transformed to a lower voltage for safe use in homes and offices. This use of higher voltages leads to significantly more efficient power transmission.
AC is also used in applications such as guitar amplifiers, audio and radio signals, and computer mainframe systems. In these cases, different waveforms like triangular or square waves may be used. AC is well-suited for these applications as it can carry information such as sound (audio) or images (video) through the modulation of an AC carrier signal.
At very high frequencies, AC no longer flows within the wire but on its surface, a phenomenon known as the skin effect. This effect increases the effective AC resistance of the conductor, leading to higher energy loss due to ohmic heating. To minimise energy loss at high frequencies, pairs of wires may be twisted together to form a twisted pair, which cancels out electromagnetic radiation and reduces losses.
AC motors and generators are generally simpler in design and more reliable than their DC counterparts, making them more cost-effective to manufacture. AC technology utilises the principles of electromagnetic induction, where a rotating magnetic field is produced by alternating current passing through stationary coils of wire, causing a rotating magnet to spin on its shaft.
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Direct Current (DC)
DC is often used to refer to constant polarity, where the voltage or current is constant. The voltage and current can vary over time, as long as the direction of flow does not change. For example, a AA battery provides a constant voltage of 1.5V.
Direct current is used in any device that uses batteries as a power source, such as in most household electronics. It is also used to charge batteries, so rechargeable devices like laptops and cell phones come with an AC adapter that converts alternating current to direct current.
DC is also used in high-voltage direct current (HVDC) electric power transmission systems, which is the only technically feasible option for long-distance undersea cables. HVDC transmission can be more efficient than AC for very long distances. However, it is much more expensive and difficult to change the voltage of direct current, making it a poor choice for high-voltage transmission of electricity.
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Voltage
The terms "voltage" and "electric potential" are ambiguous and can refer to different things in different contexts. Voltage is often used interchangeably with the term
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Conductivity
Electrical conductivity is a measure of how readily a material transmits an electrical current. It is the measure of the amount of electrical current a material can carry or its ability to carry a current. Materials with high conductivity, like copper and aluminium, are called conductors. Metals like silver and copper have high electrical conductivity, making them excellent conductors. On the other hand, materials with low conductivity, like rubber and glass, are called electrical insulators. Electrical conductivity is largely determined by the number of electrons in the outermost shell; these electrons determine the ease with which mobile electrons are generated.
In electrolytes, entire ions move, carrying their net electrical charge. In electrolyte solutions, the concentration of the ionic species is a key factor in the conductivity of the material. The voltage applied across the metal causes electrons to drift towards the positive terminal. The actual drift velocity of electrons is typically small, but due to the large number of moving electrons, even a slow drift velocity results in a large current density.
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Ammeters
An ammeter (an abbreviation of ampere meter) is an instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. Ammeters usually have low resistance to prevent a significant voltage drop in the circuit being measured.
There are several types of ammeters, including moving iron, moving magnet, and hot-wire ammeters. Moving iron ammeters use a piece of iron that moves when acted upon by the electromagnetic force of a fixed coil of wire. This type of ammeter responds to both direct and alternating currents. Moving magnet ammeters operate on the same principle as moving coil ammeters, except that the coil is mounted in the meter case and a permanent magnet moves the needle. These ammeters can carry larger currents than moving coil instruments. Hot-wire ammeters pass a current through a wire that expands as it heats up. Although these instruments have a slow response time and low accuracy, they are sometimes used to measure radio-frequency current.
Digital ammeter designs use a shunt resistor to produce a calibrated voltage proportional to the current flowing. This voltage is then measured by a digital voltmeter, through the use of an analog-to-digital converter (ADC). The digital display is calibrated to display the current through the shunt.
The D'Arsonval galvanometer is a type of moving coil ammeter that uses magnetic deflection. Current passing through a coil placed in the magnetic field of a permanent magnet causes the coil to move. The modern form of this instrument was developed by Edward Weston and uses two spiral springs to provide the restoring force.
Frequently asked questions
AC stands for Alternating Current, which is the current that enters homes and powers appliances such as refrigerators, washing machines, and dishwashers.
DC stands for Direct Current, which is a unidirectional flow of electric charge, as seen in batteries.
EMF is an abbreviation for Electromagnetic Field or Electromotive Force.
EV stands for Electronvolt, a unit of energy similar to joules.
FDC stands for Flow Duration Curve, which describes the relationship between the magnitude and duration of stream flows.
