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Chapter 7: Problem 20

Describe Ohm's law.

Short Answer

Expert verified
Answer: Ohm's Law formula is given by \[I = \frac{V}{R}\], where I represents the current flowing through the conductor, V represents the voltage across the two points in the circuit, and R represents the resistance of the conductor. Ohm's Law is used to analyze electrical circuits by allowing us to calculate one of the three quantities (voltage, current, and resistance) if the other two are known. This helps in understanding the behavior of the circuit components and the relationship between the voltage, current, and resistance in the circuit.

Step by step solution

01

Definition of Voltage, Current, and Resistance

Voltage (V) is the electric potential difference between two points in a circuit. It is measured in volts (V). Current (I) is the flow of electric charge in a conductor and is measured in amperes (A). Resistance (R) is a property of a material that opposes the flow of electric current and is measured in ohms (惟).
02

Ohm's Law Formula

Ohm's Law states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across those points and inversely proportional to the resistance (R) of the conductor. Mathematically, it is represented as: \[I = \frac{V}{R}\]
03

Application of Ohm's Law

Ohm's law is used to understand and analyze electrical circuits. By knowing any two of the three quantities (voltage, current, and resistance), we can calculate the third quantity using the formula. For example, if we know the voltage across a resistor and the resistor's value, we can calculate the current flowing through it. Similarly, if we know the current and resistance, we can calculate the voltage across the resistor, and so on.

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