Calculate electric time constant (T or RC)

Time Constant Calculator

Online calculator to calculate the energy (E) and time constant (RC) in a capacitor for the given voltage across it. You can determine two different values from the calculator. Time constant (T) can be determined from the values of capacitance (C) and load resistance (R). Energy stored on a capacitor (E) can be determined by giving all three inputs: voltage (V), capacitance and load resistance.

 

Voltage (V) Optional		Capacitance (uF)		Load Resistance (Ohms)
	×		×
Seconds (S)		Joules (J)

Calculate V = I * R (Ohm's Law)

Ohm's Law Calculator

Ohm's law states that the current through a conductor between two points is directly proportional to the potential difference across the two points.

 

Resistance (Ω)		Current I(A)		Voltage (V)
	×
Voltage (V)		Resistance (Ω)		Current I(A)
	÷
Voltage (V)		Current I(A)		Resistance (Ω)
	÷

Calculate your mobile phone battery life

Battery Life Calculator

Generally, battery life is calculated based on the current rating in milli Ampere per Hour and it is abbreviated as mAh. Ampere is an electrical unit used to measure the current flow towards the load. The battery life or capacity can be calculated from the input current rating of the battery and the load current of the circuit. Battery life will be high when the load current is less and vice versa. The calculation to find out the capacity of battery can be mathematically derived from the following formula:

Battery Life = Battery Capacity in Milli amps per hour / Load Current in Mill amps * 0.70

 

Battery Capacity (mAh)		Device Consumption (mA)
	÷		×	0.7*
Estimated Hours

*The factor of 0.7 makes allowances for external factors which can affect battery life.

Calculate 6-band resistance

6 Band Resistor Color Code Calculator

This tool is used to decode information for color banded axial lead resistors. Select the number of bands, then their colors to determine the value and tolerance of the resistors.

Number of Bands:

Select the color of each band on the resistor:
None Brown Red Orange Yellow Green Blue Violet Gray White	None Black Brown Red Orange Yellow Green Blue Violet Gray White	None Black Brown Red Orange Yellow Green Blue Violet Gray White	None Black Brown Red Orange Yellow Gold Silver	None Brown Red Green Blue Violet Gold Silver	None Brown Red Orange Yellow Blue Violet

Resistor Value:

Calculate 5-band resistance

5 Band Resistor Color Code Calculator

This tool is used to decode information for color banded axial lead resistors. Select the number of bands, then their colors to determine the value and tolerance of the resistors.

Number of Bands:

Select the color of each band on the resistor:
None Brown Red Orange Yellow Green Blue Violet Gray White	None Black Brown Red Orange Yellow Green Blue Violet Gray White	None Black Brown Red Orange Yellow Green Blue Violet Gray White	None Black Brown Red Orange Yellow Gold Silver	None Brown Red Gold Silver

None Brown Red Orange Yellow Blue Violet

Resistor Value:

Calculate 4-band resistance

4 Band Resistor Color Code Calculator

This tool is used to decode information for color banded axial lead resistors. Select the number of bands, then their colors to determine the value and tolerance of the resistors.

Number of Bands:

Select the color of each band on the resistor:
None Brown Red Orange Yellow Green Blue Violet Gray White	None Black Brown Red Orange Yellow Green Blue Violet Gray White	None Black Brown Red Orange Yellow Green Blue Gold Silver	None Brown Red Gold Silver

None Black Brown Red Orange Yellow Green Blue Violet Gray White None Brown Red Orange Yellow Blue Violet

Resistor Value:

How to measure the resistance with Resistor Color Code?

Components and wires are coded are with colors to identify their value and function.

 

The colors brown, red, green, blue, and violet are used as tolerance codes on 5-band resistors only. All 5-band resistors use a colored tolerance band. The blank (20%) "band" is only used with the "4-band" code (3 colored bands + a blank "band").

Example #1

 
 A resistor colored Yellow-Violet-Orange-Gold would be 47 kΩ with a tolerance of +/- 5%.

Example #2

  A resistor colored Green-Red-Gold-Silver would be 5.2 Ω with a tolerance of +/- 10%.

Example #3

 A resistor colored White-Violet-Black would be 97 Ω with a tolerance of +/- 20%. When you see only three color bands on a resistor, you know that it is actually a 4-band code with a blank (20%) tolerance band.

Example #4

 A resistor colored Orange-Orange-Black-Brown-Violet would be 3.3 kΩ with a tolerance of +/- 0.1%.

Example #5

 A resistor colored Brown-Green-Grey-Silver-Red would be 1.58 Ω with a tolerance of +/- 2%.

Example #6

 A resistor colored Blue-Brown-Green-Silver-Blue would be 6.15 Ω with a tolerance of +/- 0.25%.