What are the reasons to have measured value of currents are different from calculated values?

There are two main reasons:

• The model used for the component in the calculations isn’t perfect. This could be simply due to the tolerance of the component (at DC), but at higher frequencies components are much more complex.
• The measuring equipment has uncertainty.

How does the increased resistance affect current?

The current is directly proportional to the voltage and inversely proportional to the resistance. This means that increasing the voltage will cause the current to increase, while increasing the resistance will cause the current to decrease.

What is color code resistance?

Resistor Color Coding uses colored bands to quickly identify a resistors resistive value and its percentage of tolerance with the physical size of the resistor indicating its wattage rating. The colors brown, red, green, blue, and violet are used as tolerance codes on 5-band resistors only.

What is the relationship between the voltage and current values obtained?

Ohm’s law defines the relationship between the voltage, current, and resistance in an electric circuit: i = v/r. The current is directly proportional to the voltage and inversely proportional to the resistance.

Is the resistance the same as the color code?

Yes, the resistance is similar, the color code only decides what the resistance is (plus/minus some accuracy, also color coded). However, what is not color coded is the wattage (how many Watts the resistor can handle). Mostly bigger resistors have more wattage ‘capability’.

What is the tolerance value of a resistor?

All electronic components have a tolerance value in their specification. For resistors, it is specified as a plus or minus tolerance. Typical ranges are 5\%, 10\%, and 20\%, though you can get 1\% and 0.1\% (matched set) resistors if you want to pay the price.

How to calculate the value of a resistor?

To calculate the value of a resistor using the color coded stripes on the resistor, use the following procedure. Step One: Turn the resistor so that the gold or silver stripe is at the right end of the resistor. Step Two: Look at the color of the first two stripes on the left end. These correspond to the first two digits of the resistor value.

How to determine the resistance of a non-cylindrical resistor?

For non-cylindrical and some large cylindrical resistors, the resistance is indicated with letters and numbers printed on the package. What you have in your picture look like 1/2 W and 1/4 W resistors. Yes, the resistance is similar, the color code only decides what the resistance is (plus/minus some accuracy, also color coded).