Ohm’s Law Definition, Formula, Example
Ohm’s Law Definition, Formula, Example Explained in Detail.
Ohm’s law describes the relationship between Voltage, Resistance and Current where Voltage (V) is trying to force charge to flow, Resistance (R) is resisting that flow, and the actual resulting Current (I).
Ohm’s Law
Ohm’s Law Definition
- Ohm’s Law states that electric current is proportional to voltage and inversely proportional to resistance.
- Mathematically, the law states that V = IR, where V is the voltage difference, I is the current in amperes, and R is the resistance in ohms.
Who Invented Ohm’s Law?
Ohm’s Law is Named after the Great German Physicist and Mathematician – Georg Simon Ohm. He was born on March 16, 1789 and died on July 6, 1854.
Georg Simon Ohm did a research on the Battery Invented by the Italian scientist Alessandro Volta.
He concluded his research with a Formula which states that the current flow through a conductor is directly proportional to the potential difference (voltage) and inversely proportional to the resistance. This relationship is known as Ohm’s law.
Georg Simon Ohm
Ohm’s Law Formula
The Ohm’s law formula helps to calculate voltage, current and resistance.
I = V / R; where
- I = Electrical Current Flowing through the Resistor
- V = Voltage Drop of the Resistor
- R = R is the resistance of the resistor, measured in Ohms (Ω)
Understanding Ohm’s Law
As per the law, we can state that:
- Large voltage and low resistances produces large current.
- Large resistance limit current to low values.
Question: Almost every electric circuit is more complicated than just a basic circuit with a battery and a resistor. So which voltage does the formula refer to?
Answer: Well, it refers to the voltage across the resistor, the voltage between the two terminal wires.
Looked at another way, that voltage is actually produced by the resistor.
The resistor is restricting the flow of charge, slowing it down, and this creates a traffic jam on one side, forming an excess of charge with respect to the other side.
Any such charge difference or separation results in a voltage between the two points.
Ohm’s law tells us how to calculate that voltage if we know the resistor value and the current flow. This voltage drop is analogous to the drop in water pressure through a small pipe or small nozzle.
Examples
Example-1: Find the current of an electrical circuit that has resistance of 100 Ohms and voltage supply of 10 Volts.
Solution:
- V = 10 V
- R = 100 Ω
- I = V / R = 10V / 100Ω = 0.1A = 100mA
Example-2: Find the voltage applied across 100 kΩ resistors when 5 mA current flows through it
Solution: V = 100 kΩ * 5 mA = 500 V
Example-3: Find the value of a Resistor which drops 100 V when 50 mA current is flowing through it.
Solution: R = 100 V / 50mA = 200 Ω
Video: Understand What is Ohms Law
FAQs: What is Ohm’s Law?
What is the formula for Ohm’s Law?
The formula for Ohm's Law is: V = I * R
- V: Voltage (in volts)
- I: Current (in amperes or amps)
- R: Resistance (in ohms)
Provide an example of Ohm’s Law in action?
Let's say we have a resistor with a resistance of 100 ohms, and a current of 2 amps flows through it. Using Ohm's Law, we can find the voltage drop across the resistor: V = I * R.
V = 2 A * 100 Ω = 200 V
So, the voltage across the resistor is 200 volts.
How is Ohm’s Law useful in real-world applications?
Ohm's Law is essential for designing, analyzing, and troubleshooting electrical circuits. It helps engineers and technicians understand how voltage, current, and resistance interact, allowing them to predict and control the behavior of electronic components and systems.
Does Ohm’s Law apply to all types of conductors and components?
Ohm's Law is primarily applicable to linear conductors and components, i.e those that obey a proportional relationship between voltage and current. However, some materials and components, such as diodes and transistors, exhibit non-linear behavior and do not strictly follow Ohm's Law. In such cases, more complex equations and models are needed to describe their behavior accurately.
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Example #3 Solution: R = 100 V / 50mA = 200 Ω
I’m new to Ohm’s Law and such, but wouldn’t the answer be * 2k Ω * rather than * 200 Ω * ?
I discovered this site interesting to have concisely informed me about the basis principle of electronics as ohms” law is concerned; I look forward to discovering more about electronics as a beginner from the Liberal Arts but now interested in electrons or electronics. This passion might lead me to developing the electrical engineering.
When was this made?
Question 3❓
answer:100v / 0.05 = 2000 ohm
V/I = R
V=voltage
R=resistance
I=Current/or Intensity