Calculate voltage, current, or resistance using Ohm's Law. The mathematical equation representing Ohm's Law is:
Formula:
V = I * R
Formula Breakdown:
V represents the voltage (measured in volts)
I represents the current (measured in amperes)
R represents the resistance (measured in ohms)
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:
Calculating Voltage (V):
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
Calculating Current (I):
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
Calculating Resistance (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
Power Calculator
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.
Formula:
P = V * I
Formula Breakdown:
P represents the power (measured in watts)
V represents the voltage (measured in volts)
I represents the current (measured in amperes)
Resistor Value Calculator
Coming soon
Equivalent Resistance in a Parallel Circuit
The equivalent resistance (Req) in a parallel circuit is the reciprocal of the sum of the reciprocals of the individual resistances (R1, R2, R3, ..., Rn) of all components connected in parallel.
Formula:
1 / Req = 1 / R1 + 1 / R2 + 1 / R3 + ... + 1 / Rn
Formula Breakdown:
Req: The equivalent resistance of the parallel circuit.
R1, R2, R3, ..., Rn: The individual resistances of each component in the parallel circuit.
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 / Req = 1 / R1 + 1 / R2 + 1 / R3 + ... + 1 / Rn mathematically expresses this concept, where each 1 / Ri is the reciprocal of the resistance of a specific component in the parallel circuit.
Equivalent Resistance in a Series Circuit
The equivalent resistance (Req) in a series circuit is the sum of the individual resistances (R1, R2, R3, ..., Rn) of all components connected in series.
Formula:
Req = R1 + R2 + R3 + ... + Rn
Formula Breakdown:
Req: The equivalent resistance of the series circuit.
R1, R2, R3, ..., Rn: The individual resistances of each component in the series circuit.
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 Req = R1 + R2 + R3 + ... + Rn mathematically represents this concept, where each Ri is the resistance of a specific component in the series.
Voltage Drop Calculator - Single-Phase
Calculate the voltage drop in a single-phase electrical circuit.
Formula:
Voltage Drop = (2 * Current * Length * Resistance) / (1000 * Conductor Size)
Formula Breakdown:
The constant factor 2 is used because the voltage drop is calculated as a two-way trip (to and from the load).
Current is the current flowing through the wire in Amperes.
Length is the length of the wire in feet.
Resistance is the resistance of the wire in ohms per thousand feet (or per kilometer).
The constant factor 1000 is used to convert the resistance from ohms per thousand feet to ohms per foot.
Conductor Size is the cross-sectional area of the wire in circular mils (CM).
