Question

How do you calculate current using Ohm's Law?

Answer 1

Ohm's Law is a fundamental principle in electrical engineering and physics that describes the relationship between voltage, current, and resistance in an electrical circuit. It states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) of the conductor. Mathematically, Ohm's Law is expressed as:


=


I=
R
V
    ​


where:
I = Current (measured in Amperes, A)
V = Voltage (measured in Volts, V)
R = Resistance (measured in Ohms, Ω)

To calculate the current flowing through a circuit using Ohm's Law, you need to know the voltage across the two points in the circuit and the resistance of the conductor or component between those points. Simply divide the voltage (V) by the resistance (R) to get the current (I) in Amperes.

For example, let's say you have a circuit with a voltage of 12 Volts and a resistance of 4 Ohms. To calculate the current:


=
12
 Volts
4
 Ohms
=
3
 Amperes
I=
4 Ohms
12 Volts
    ​

=3 Amperes

So, the current flowing through the circuit would be 3 Amperes. Remember to use consistent units (Volts for voltage, Ohms for resistance) to get the correct result.