• ResCalc Master

Resistor calculator Color codes EIA standard resistor values Resistor dimensions Parallel resistor calculator Series resistor calculator LED resistor calculator
Version: 1.0.8
Release date: 02.06.2014
Price: Free
Language: Bosanski, English, Italiano, Ελληνικά, Русский
Operating system (win32 / win-amd64): Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8

ResCalc Master is a resistor calculator outfitted with various tools, meant to aid in work related to resistors.

The main window of the program is meant for decoding and coding of resistors with 3 to 6 bands, it includes calculation of resistor value according to colour and vice versa, ability to convert resistor value into Ω, KΩ, MΩ, GΩ, automatic calculation, resistor standard calculation as well as a visual and textual display of resistor colour.
Tools are comprehensive: a colour code table, an EIA standard value table, decoding examples, resistor orientational dimensions as well as a series, parallel and LED calculator.

- Determination of a resistor's value according to its colors
- Determination of a resistor's color accordng to its value
- Determination of a resistor's standard according to its value
- Support for resistors with from 3 to 6 bands
- Color code table that includes decoding example
- EIA standard value table (E6, E12, E24, E48, E96, E192)
- Resistor orientational dimensions dependent on strength of dissipation
- Series resistor calculator
- Parallel resistor calculator
- LED resistor calculator

What's new?
Version 1.0.8:
Updated Italian translation
Version 1.0.7:
Added Russian and Greek translation
Version 1.0.6:
- Improved some of the functions present in the serial, parallel and LED calculators
Version 1.0.5:
- Added Tabbed navigation
- Moving to next calculator field using Tab and Enter now possible
- Added calculator shortcuts (F11 = reset, F12 = calculate)
Version 1.0.4:
- Performance improvements (program runs faster than before)
- Program now compatible with 64-bit systems
Version 1.0.3:
- Added Italian translation
- Performance improvements
Version 1.0.2:
- Added LED resistor calculator
Version 1.0.1:
- Fixed Alt+F4 bug, now closes the program the first time
- Chosen unit of resistance (Ω, KΩ, MΩ, GΩ, Auto) is remembered on next startup
- Added automatic checking for updates on program startup
- Added manual update function
- Added bug report function
Version 1.0.0:
- This version is the first release


• Ohm’s law

Ohm’s Law is the relationship between the current I flowing through a resistance R and the potential drop across it V. The current is directly proportional to the potential difference across the resistance and is inversely proportional to the resistance,

I = V / R

As an alternative, Ohm’s Law may be stated as: The potential difference V across a resistance is directly proportional to the current I flowing through the resistance and the resistance R, or

V = I x R

Ohm’s Law can be rearranged to define the resistance R so that

R = V / I

If the potential difference across the resistance is measured in volts (V) and the current flowing through the resistance is measured in amperes (A), then the resistance values will be in units of ohms (Ω).

• Resistors in series

A series circuit is a circuit in which the components are connected in a line, one after the other.

When the resistances are connected in series, the total resistance (Rt) in the circuit is equal to the sum of the resistances of all the paths of the circuit. The formula for solving for total series resistance is:

Rt = R1 + R2 + R3 ...

• Resistors in parallel

A parallel circuit is a circuit in which two or more components are connected across the same voltage source.

When the resistances are connected in parallel, the total resistance (Rt) in the circuit is less that the resistor with the least value. The formulas for solving for total parallel resistance are:

Rt = 1 / ((1 / R1) + (1 / R2) + (1 / R3) ...)
1 / Rt = (1 / R1) + (1 / R2) + (1 / R3) ...

• LED circuit

To calculate the resistor needed for a simple LED circuit, simply take the voltage drop away from the source voltage then apply Ohm's Law.

R = (Vs - Vled) / Iled

Vs is the source voltage, measured in volts (V),
Vled is the voltage drop across the LED, measured in volts (V),
Iled is the current through the LED, measured in Amperes (A), and
R is the resistance, measured in Ohms (Ω).
Back to top