Calculate voltage, current, or resistance using Ohm's Law. The mathematical equation representing Ohm's Law is:
V = I * R
This equation allows you to calculate any one of the three variables if you know the values of the other two. Here's a breakdown of how the equation can be used in different scenarios:
If you know the current (I) flowing through a circuit and the resistance (R) of the circuit, you can determine the voltage (V) using the formula:
V = I * R
If you know the voltage (V) across a circuit and the resistance (R) of the circuit, you can determine the current (I) using the formula:
I = V / R
If you know the voltage (V) across a circuit and the current (I) flowing through the circuit, you can determine the resistance (R) using the formula:
R = V / I
Calculate power using voltage and current. The power formula shows that power is equal to the product of voltage and current. This formula is applicable to both DC (direct current) and AC (alternating current) circuits.
P = V * I
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The equivalent resistance (R_{eq}) in a parallel circuit is the reciprocal of the sum of the reciprocals of the individual resistances (R_{1}, R_{2}, R_{3}, ..., R_{n}) of all components connected in parallel.
1 / R_{eq} = 1 / R_{1} + 1 / R_{2} + 1 / R_{3} + ... + 1 / R_{n}
In a parallel circuit, each component has the same voltage applied across it, and the total current is the sum of the currents through each component. The reciprocal of the equivalent resistance is calculated by adding the reciprocals of the individual resistances, representing how current divides and flows through parallel branches.
The formula 1 / R_{eq} = 1 / R_{1} + 1 / R_{2} + 1 / R_{3} + ... + 1 / R_{n} mathematically expresses this concept, where each 1 / R_{i} is the reciprocal of the resistance of a specific component in the parallel circuit.
The equivalent resistance (R_{eq}) in a series circuit is the sum of the individual resistances (R_{1}, R_{2}, R_{3}, ..., R_{n}) of all components connected in series.
R_{eq} = R_{1} + R_{2} + R_{3} + ... + R_{n}
In a series circuit, the current flows through each component one after another, so the total resistance experienced by the current is the sum of all resistances in the circuit. This can be understood by examining how resistances add up in a linear path, contributing to the overall resistance encountered by the current.
The formula R_{eq} = R_{1} + R_{2} + R_{3} + ... + R_{n} mathematically represents this concept, where each R_{i} is the resistance of a specific component in the series.
Calculate the voltage drop in a single-phase electrical circuit.
Voltage Drop = (2 * Current * Length * Resistance) / (1000 * Conductor Size)