Umair Gaines
The electrical field has two units: the first is v/m (voltage/meter) and the second is N/C (Newton/Coulomb). The unit for the magnitude of the electric field is simpler to write as a composite of derived units, rather than composing it from base units. Depending on the context, it may be more convenient to think of the electric field in terms of V/m or N/C. The V/m unit reflects the work that could be done by the electric field on a unit charge per unit distance. On the other hand, the N/C unit reflects the force that a unit charge will experience in the electric field, which is useful when thinking about charged objects and the forces they experience.
| Characteristics | Values |
|---|---|
| Full Form | Non-Contact Voltage |
| Principle | Electromagnetic Induction |
| Application | Detecting voltage without direct physical contact with the circuit or conductor |
| Safety | Reduces the risk of electric shock |
| Product | nVent SCHROFF's Rack Safety Plus |
| Features | Configurable power outlets, input connectors, emergency power button |
| Standards | Meets the EN ISO 13849-1 category 3 standard |
| Certifications | CE-certified, UL-certification underway |
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What You'll Learn
V/m unit reflects work done by the electric field
The volt per meter (V/m) unit is a measure of electric field strength. It reflects the work done by the electric field on a unit charge per unit distance.
Electric field strength can be defined in terms of potential difference or voltage. The potential difference between two points in an electric field is equal to the electric field strength multiplied by the distance between these points. Voltage, or electric potential difference, is the energy required to move a unit charge between two points.
The V/m unit can be understood by visualizing an electric field as a grid where each square meter represents the space influenced by the voltage. The force exerted on a charge at any point on this grid can be measured. When a charge moves through a one-meter distance within a field of one volt per meter, the work done on the charge is equal to the force multiplied by the distance (in meters).
The V/m unit is interchangeable with the newtons per coulomb (N/C) unit. The N/C unit reflects the force that a unit charge will experience in the electric field. The electric field unit equivalence arises from the fundamental equations defining the electric field and voltage. The relationship between these units can be seen by reverting to basic SI definitions: E=N/C=kg*m/(s^2)C and V=j/C=kg*m^2/(s^2)C so: V/m=kg*m/(s^2)C which is the same unit as N/.
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N/C unit reflects force on a unit charge
Electric fields are created by charged objects, and they exert a force on other charged objects within their field. The electric field unit measures the strength of an electric field, and it can be expressed in two ways: volts per meter (V/m) and newtons per coulomb (N/C). The N/C unit reflects the force experienced by a unit charge within an electric field.
The electric field strength (E) is defined by the force (F) experienced by a positive test charge (q) placed in the field, described by the equation:
> E = F/q
The units of force are newtons (N), and the units of charge are coulombs (C). Therefore, the units of electric field strength can be expressed as newtons per coulomb (N/C). Voltage (V) is defined as the work done (W) per unit charge (q) to move the charge between two points, given by the equation:
> V = W/q
The unit of work is joules (J), which is equivalent to newton-meters (N*m). Since voltage itself is work (or energy) per charge, V/m can be resolved to (J/C)/m, which simplifies to N/C. Thus, V/m and N/C are equivalent for electric field strength.
The Superposition Principle states that when multiple forces act on a charge, the net force is the vector sum of all individual forces. Coulomb's Law describes the electrostatic force between two charged objects, with the force (F) directly proportional to the product of the magnitudes of the charges (q1 and q2) and inversely proportional to the square of the distance (r) between them:
> F = k * |q1 * q2| / r^2
Here, k is Coulomb's constant. This law is fundamental for calculating forces acting on charged particles.
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V/m and N/C are equivalent but differ in focus
The electrical field has two units: V/m (voltage per meter) and N/C (Newton per Coulomb). Depending on the context, it may be more convenient to use one unit over the other, but they are equivalent and differ only in their focus on different physical relationships.
The V/m unit reflects the work done by the electric field on a unit charge per unit distance. It is useful when thinking about the electric field between two capacitor plates, which is proportional to the potential difference and inversely proportional to their distance.
On the other hand, the N/C unit reflects the force that a unit charge will experience in the electric field. This perspective is valuable when considering charged objects and the forces they encounter. For example, when thinking about the forces experienced by charged particles in an electric field, such as electrons or ions.
In electrical engineering, these two units are essential for understanding and working with electric fields. The choice between V/m and N/C depends on the specific application and the nature of the problem being addressed.
It's worth noting that in electrical school, electricians are taught that only a changing electromagnetic field or voltage can induce voltage in another conductor, which is a fundamental concept related to these units.
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Volt is the unit of voltage
The volt, denoted by the letter V, is the standard unit of measurement for voltage in the International System of Units (SI). The volt is named after Alessandro Volta, who in 1800 developed the "voltaic pile", a forerunner of the battery that produced a steady electric current.
Voltage is the total work required to move a unit of charge between two points in a static electric field. It is also referred to as electric potential difference, electric pressure, or electric tension. The volt can be defined in several ways. One definition is that one volt is the electric potential between two points of a conducting wire when an electric current of one ampere dissipates one watt of power between those points. This can be expressed as 1 V = 1 kg m^2 s^-3 A^-1 (one-kilogram meter squared per second cubed per ampere).
Another way to define the volt is as the potential difference between two points in an electric circuit that imparts one joule (J) of energy per coulomb (C) of charge that passes through the circuit. This can be expressed as 1 V = 1 J/C. The volt can also be defined in terms of SI base units as V = W/A, where V is voltage, W is power, and A is electric current.
The volt is also the unit of electromotive force, which is the maximum potential difference provided by a source when no current is flowing. The unit of electromotive force is the same as voltage, which is volt.
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Ampere is the unit of electric current
The ampere, often shortened to amp, is the standard unit of electric current in the International System of Units (SI). It is used by scientists and technologists and is defined as the flow of one coulomb of electricity per second. One ampere is equal to one coulomb (C) moving past a point per second. The unit is named after French mathematician and physicist André-Marie Ampère (1775–1836), considered the father of electromagnetism.
The ampere can be defined by Ampère's force law, which states that there is an attractive or repulsive force between two parallel wires carrying an electric current. This force was used in the formal definition of the ampere, giving the vacuum magnetic permeability (magnetic constant, μ0) a value of exactly 4π × 10−7 henries per metre (H/m, equivalent to N/A2).
Prior to the 2019 redefinition of the SI, the ampere was defined as the current that, if maintained in two straight parallel conductors of infinite length, of 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. This definition was realised using a Kibble balance but was difficult to reproduce in practice.
The 2019 revision of the SI defined the ampere by fixing the elementary charge e to be exactly 1.602176634×10−19 coulombs, which means an ampere is an electric current equivalent to 1019 elementary charges moving every 1.602176634 seconds, or approximately 6.241509074×1018 elementary charges moving in a second. This definition was agreed upon by the General Conference on Weights and Measures (CGPM) and represents a flow of one coulomb of electricity per second.
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Frequently asked questions
NVT stands for nVent Electric plc, a company that designs, manufactures, markets, installs, and services high-performance products and solutions for protecting and connecting sensitive equipment, buildings, and critical processes.
The electric field can be measured using two different units: V/m (voltage per meter) and N/C (Newton per Coulomb). The choice between the two depends on the specific application and the physical relationships being considered.
NCV stands for Non-Contact Voltage and refers to a method of testing for voltage without direct physical contact with the circuit or conductor. This technology is based on electromagnetic induction, where an induction coil senses changes in the electric field and generates an induced electromotive force.
Rack Safety Plus is a modular safety and power distribution unit designed by nVent SCHROFF to protect and connect electronics enclosed within 19" cabinets. It integrates safety and power distribution functions, providing features such as configurable power outlets, input connectors, and emergency power buttons.
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