Voltage definition10/4/2023 ![]() SI units make sure that the students do not get confused while reading about units. SI or System International units is an international system of measurement that is used universally in all technical and scientific research. Thus, the current is equal to the electromotive force of the source divided by the total resistance present in the circuit. When a complete circuit is made using a resistor that has resistance R, then the current flowing through can be found using the equation, This can also be called the terminal voltage of the battery. If r denotes the internal resistance of a battery, then the voltage difference present across the battery is, Real sources such as batteries are not considered ideal sources as they have some source of internal resistance. In the case of an ideal source, the electromotive force is equal to the voltage difference, Here volt is equal to a joule per coulomb (J/C). The unit of electromotive force is the same as voltage, that is it is volt. Electromotive force is represented using the symbol ε. And if the current is flowing, then it is the same on both the terminals of the voltage source.Ī voltage source is a part of a complete circuit that can produce an electromotive force. In case the ends of the voltage source are connected to a circuit that has multiple numbers of resistors, voltmeters, etc then a complete circuit is formed and the current can now flow from one end to the other. ![]() The voltage source can be a battery or any other source which has fixed potential difference and direct current. It can also be expressed as it is given in its SI unit,ġ V = 1 kg m 2 s -3 A -1 (One-kilogram meter squared per second cubed per ampere).Ī voltage source is basically a device that is used in electric circuits having fixed potential differences at both ends. Volt can be defined as ‘the electric potential present along with a wire when an electric current of one ampere dissipates the power of 1 watt (W).Īlso, volt can be expressed as the potential difference that exists between two points in an electric circuit which imparts energy of 1 joule (J) per coulomb of charge that flows through the circuit. Thus, due to this volt can be defined in a number of ways. volt is a derived SI unit of electromotive force or electric potential. The SI unit for voltage is Volt and is represented by the letter v. The unit of potential difference is Volt (V) which is also equal to Joule per Coulomb (J/C). In a conductor, if the electric field is uniform, the potential difference between the points is,īy using various equations of resistivity, current, and resistance, another equation can be derived,įrom the above equation, we can deduce that the voltage or the potential difference across the resistor can be found by multiplying the current with the resistance. ![]() Voltage can be defined as the electric potential between two points.
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