What are the 3 formulas in Ohm's law?

 Ohm's law

What are the 3 formulas in Ohm's law?

Ohm's law is a fundamental law of electronics that relates the voltage, current, and resistance in an electrical circuit. It states that the current flowing through a conductor is directly proportional to the voltage across the conductor, provided all physical conditions and temperatures remain constant. The constant of proportionality is called resistance.

There are three formulas that can be used to express Ohm's law:

1. V = I * R
2. I = V / R
3. R = V / I

Where:

V is the voltage in volts
I is the current in amps
R is the resistance in ohms

For example, if the voltage across a resistor is 100 volts and the resistance of the resistor is 10 ohms, then the current through the resistor will be 10 amps.

How to use the formulas

The formulas for Ohm's law can be used to calculate any of the three variables given the other two. For example, if you know the voltage and the resistance, you can use the formula V = I * R to calculate the current.

Here are some examples of how to use the formulas for Ohm's law:

To calculate the current:

V = 100 volts
R = 10 ohms
I = V / R = 100 / 10 = 10 amps

To calculate the voltage:

I = 10amps
R = 10 ohms
V = I * R = 10 * 10 = 100 volts

To calculate the resistance:

V = 100 volts
I = 10 amps
R = V / I = 100 / 10 = 10 ohms

Limitations of Ohm's law

Ohm's law is a good approximation for many electrical circuits, but it does not apply in all cases. For example, Ohm's law does not apply to circuits that contain non-linear components, such as transistors.

Conclusion

Ohm's law is a fundamental law of electronics that is used to calculate the voltage, current, and resistance in electrical circuits. The three formulas for Ohm's law can be used to calculate any of the three variables given the other two.

Also Read: What is electric current and its unit and formula

I hope this blog post has helped you to understand the 3 formulas in Ohm's law. If you have any questions, please feel free to leave a comment below.

FAQs about Ohm's law:

Q: What is Ohm's law?

A: Ohm's law is a fundamental law of electronics that states that the current flowing through a conductor is directly proportional to the voltage across the conductor, provided all physical conditions and temperatures remain constant.

Q: What is the formula for Ohm's law?

A: The formula for Ohm's law is: V = IR
where:V is the voltage across the conductor in volts
I is the current flowing through the conductor in amps
R is the resistance of the conductor in ohms

Q: What are the applications of Ohm's law?

A: Ohm's law is a very important law in electronics, and it is used to calculate the voltage, current, and resistance in many different electrical circuits. Some of the applications of Ohm's law in electronics include:

• Calculating the current flowing through a resistor
• Calculating the voltage drop across a resistor
• Calculating the resistance of a conductor
• Determining the power dissipation of a resistor
• Designing electrical circuits

Q: What are the limitations of Ohm's law?

A: Ohm's law only holds true if the following conditions are met:

• The temperature of the conductor must remain constant.
• The conductor must be made of a material that obeys Ohm's law.
• The conductor must be in a linear region of its operation.

If any of these conditions are not met, then Ohm's law may not be accurate.

Q: What are some examples of how Ohm's law can be used?

A: Here are some examples of how Ohm's law can be used:

• If you know the voltage across a resistor and the resistance of the resistor, you can use Ohm's law to calculate the current flowing through the resistor.
• If you know the current flowing through a resistor and the resistance of the resistor, you can use Ohm's law to calculate the voltage drop across the resistor.
• If you know the voltage across a resistor and the current flowing through the resistor, you can use Ohm's law to calculate the resistance of the resistor.

I hope this helps! Let me know if you have any other questions.