Physics Wallah is an Indian edtech platform that provides accessible & comprehensive learning experiences to students from Class 6th to postgraduate level. We also provide extensive NCERT solutions, sample paper, NEET, JEE Mains, BITSAT previous year papers & more such resources to students. Physics Wallah also caters to over 3.5 million registered students and over 78 lakh+ Youtube subscribers with 4.8 rating on its app.
We Stand Out because
We provide students with intensive courses with India’s qualified & experienced faculties & mentors. PW strives to make the learning experience comprehensive and accessible for students of all sections of society. We believe in empowering every single student who couldn't dream of a good career in engineering and medical field earlier.
Our Key Focus Areas
Physics Wallah's main focus is to make the learning experience as economical as possible for all students. With our affordable courses like Lakshya, Udaan and Arjuna and many others, we have been able to provide a platform for lakhs of aspirants. From providing Chemistry, Maths, Physics formula to giving e-books of eminent authors like RD Sharma, RS Aggarwal and Lakhmir Singh, PW focuses on every single student's need for preparation.
What Makes Us Different
Physics Wallah strives to develop a comprehensive pedagogical structure for students, where they get a state-of-the-art learning experience with study material and resources. Apart from catering students preparing for JEE Mains and NEET, PW also provides study material for each state board like Uttar Pradesh, Bihar, and others
What is the fundamental difference between voltage and current?
Voltage and current are fundamental electrical quantities. Voltage (V) is the electrical potential difference between two points, measured in volts, representing the force that drives the electric charge. On the other hand, current (I) is the flow of electric charge, measured in amperes, and represents the rate of flow of electrons in a circuit.
How are voltage and current related in a circuit?
Ohm's Law describes the relationship between voltage, current, and resistance in a circuit. It states that voltage (V) equals the product of current (I) and resistance (R), expressed as V = I * R. This formula highlights the interdependence of voltage and current, emphasizing that changes in one can affect the other.
What role does voltage play in electrical circuits?
Voltage serves as the driving force that pushes electric charges through a circuit. It provides the energy required to move electrons from one point to another. In practical terms, voltage is responsible for creating the potential difference that causes current to flow through a conductor.
How does current contribute to the operation of electrical devices?
Current is the flow of electric charge, and it is what powers electrical devices. When a circuit is closed, allowing a path for electrons to flow, current is established, and this flow of electrons is what powers devices such as light bulbs, motors, and electronic gadgets. The strength of the current determines the rate at which energy is transferred.
Can voltage exist without current or vice versa?
Voltage and current are interrelated but can exist independently. Voltage can exist without current if there is no closed circuit or path for the electrons to flow. Similarly, current cannot flow without the presence of a voltage difference. In a circuit, the two are interdependent, and changes in one parameter will affect the other, but they can exist separately in certain conditions.
Difference between Voltage and Current, Major Differences
Difference between Voltage and Current, get full insight to understand electrical circuits used in NEET physics Numerical problems. Here you will get knowledge about formula, real life applications, SI units and much more.
Praveen Kushwah27 May, 2025
Share
Difference between Voltage and Current : In the field of electricity, voltage and current are basic ideas that are essential to comprehending and explaining the behavior of electrical circuits. The electric potential difference between two points is known as voltage, and it is expressed in volts. Voltage is what drives electric charges through a circuit.
The flow of electric charge within a circuit, on the other hand, is measured in amperes and represents the speed at which electrons travel through a conductor. Ohm's Law, which describes the relationship between voltage, current, and resistance, illustrates the complex relationship between these two electrical parameters. Anyone studying electrical systems and devices or working with them in a practical setting needs to have a firm grasp of the differences between voltage and current
What is Voltage?
It is a basic electrical quantity that shows the electric potential difference between two points in a circuit, known as voltage and it is frequently represented by the letter "V." It is the force responsible for the electric current's flow. Simply, Voltage is the electrical pressure that drives charged particles (Electrons) through a conductor like a wire. The volt (V) is the unit of measurement for voltage. An electric current is created when there is a potential difference between the positive and negative terminals of a voltage source and the circuit is closed, providing a path for electrons to flow through. When creating and evaluating electrical circuits and systems, an understanding of voltage is essential.
What is Current?
Current is like the flow of electricity in a circuit. It is the flow of electric charges through a conductor, such as a wire, most often electrons. Picture it as the actual movement of water in a river. The rate at which the water flows is analogous to the current in an electrical circuit. Ampere (A) is the unit used to measure current. The flow of electric charges that occurs when a switch is turned on is referred to as current. Thus, the "flow" of electricity that drives our gadgets and illuminates our surroundings is known as the current.
SI Unit of Current
The unit of measurement for current in the SI (International System of Units) is the ampere, or simply "A." The symbol for current is usually represented by "I"
SI Unit of Voltage
The SI unit of voltage is the volt, abbreviated as "V" The letter "V" is frequently used in equations and circuit diagrams to represent voltage.
Formula of Voltage
Ohm's Law describes the relationship between current (I), voltage (V), and resistance (R) in an electrical circuit. Ohm's Law is expressed by the formula
V = I R
Where: V is the voltage (in volts), I is the current (in amperes), and R is the resistance (in ohms).
Explore -
Formula of Current
In the context of Ohm's Law, the third value can be calculated if you know any two of these values. In addition, the following formula is used to calculate electric current (I) in terms of charge (Q) and time (t)
I = Q/t
Where, I is the current (in amperes), Q is the electric charge (in coulombs), and t is the time (in seconds). These formulas are fundamental in understanding and working with electrical circuits.
Difference Between Voltage and Current
The Difference Between Voltage and Current gives an important understanding to the NEET aspirants, this will help them while solving physics numerical problems. Get glimpses based on various parameters.
Difference Between Voltage and Current
Parameter
Voltage
Current
Definition
Electrical potential
The flow of electric charge
Symbol
V
I
Measurement Unit
Volts (V)
Amperes (A)
Type of Quantity
Scalar
Vector
Causes
Potential difference
Electromotive force
Measured by
Voltmeter
Ammeter
Connection in a Circuit
Across components
Through components
Effect on a Conductor
Causes current flow
Causes voltage drop
Dependency
Independent of current
Depends on the resistance of the circuit
Work Done
Work is done when a charge moves
No work is done by the current
Application of Current and Voltage
Electricity's basic concepts of current and voltage have numerous applications in a wide range of technologies and commonplace objects. The following are a few typical uses:
Powering Electronic Devices - Electronic devices like laptops, tablets, and smartphones require current and voltage to function. These devices need current to flow to function, and voltage is supplied by batteries or other power sources.
Lighting - When voltage is applied to an LED or bulb in a lighting system, the resulting current flow generates light. This is evident in incandescent bulbs, fluorescent lamps, and LED lights.
Electric Motors - The relationship between current and magnetic fields drives the operation of electric motors. The torque is determined by the current, and the speed is determined by the applied voltage. Fans, refrigerators, and washing machines are just a few of the appliances that use this extensively.
Heating Appliances - Electric stoves, water heaters, and toasters are a few appliances that use current for heating purposes. These devices heat up when current passes through them because of their resistance.
Electronics and Circuitry - The binary values (0 and 1) in digital systems are represented by voltage in electronic circuits. Electronic devices such as computers and microcontrollers are made possible by the flow of current through their circuits.
Medical Devices - Various medical devices, such as electrocardiograms (ECGs), use current to monitor and record electrical signals in the body. Voltage is applied to electrodes, and the resulting current provides information about heart activity. Communication Systems - The roles of voltage and current are critical in communication systems. For example, in telecommunications, voice signals are represented by voltage, and their transmission through wires or optical fibers is facilitated by current.
