Resistors

Resistors

Ohms Law

The way of an ideal resistor is dictated by the relationship specified by Ohms law:

    Which is: V=I x R

Ohms law states that the voltage V across a resistor is proportional to the current I, where the constant of proportionality is the resistance R.

Equivalently, Ohms law can be stated:

    I = V divided by R

Firstly im going to talk about the resistors, there is a lot of them. So there is a few ways to identify, test and combine them.

1)      First two or three bands may be the numbers to write down.

2)      Next band is the multiplier (how many zeros to add to the number).

3)      Gold multiplier makes one decimal place smaller, Silver makes two decimal places smaller.

4)      Last band to right may be tolerance values

Here is some examples of my calculations:

1) Brown, Black, Red, Gold   thats    1000 Ohm with 5% tolerance, so the min tol is 950 Ohm and the max tol is 1050 Ohm.  The multimeter value that ive got is 989 Ohm

2) Orange, white, brown, gold   thats    380 Ohm with 5% tolerance, so the min tol is 361 Ohm and the max tol is 399 Ohm.  The multimeter value that ive got is 381 Ohm

3) Yellow, purple, black, black, brown   thats   470 Ohm with 1% tolerance, so the min tol is 465 Ohm and the max tol is 474.7 Ohm.  The multimeter value that ive got is 469 Ohm

To measure the voltage by the multimeter, ive switch it to the Ohms and connected my positive and negative leads to the resistors legs from both sides. It does not matter what side is a positive and a negative leads as from both ways, it would have the same resistance.

Here is a resistors color code, tolerance and how many zeros add to the number charts.

0 BLACK

1 BROWN

2 RED

3 ORANGE

4 Yellow                       Color Code

5 GREEN

6 BLUE

7 Violet

8 Grey

9 WHITE

Gold     5%

Silver   10%                 Tolerance

Brown  1%

0x1

1x10

2x100

3x1000

4x10000                      Zeros to the number

5x100000

6x1000000

When you connect your resistors in a series, the resistors values are just added together.  Connect them end to end, one right after another.

RT=R1+R2, example 470 Ohm + 820 Ohm is 1290 Ohm

For the series the current will be the same but the voltage will change.

When you connect your resistors in a parallel, you have to use a formula of 1/RT=1/R1+1/R2 to get the parallel calculations and which will be the total resistance value is lower than the lowest resistor value.

To get the reading you will have to connect both ends when they are side by side.

For the parallel the current will change but the voltage will stay the same.

This calculation here is to show of the electricity in these two exercises is that, when the resistor is connected in series, the Ohms are combined together and it does add up the value. But when it is in a parallel circuit, the Ohms are divided equally between the resistors and giving all the components an equal measured value.

The results were good and correct at the time when i did check them. They could of be wrong by a few things like not touching the leads from the multimeter properly to a resistor or switching it wrong, not to the Ohms.

Ive seen the study about resistors easy to understand and use in a real life. As when you make a board, or some circuit when you will have to use a resistor, you must be sure what resistens it has and doing that by checking the color code and resistens by the multimeter.

  

Here is an explanation of the component Voltage Drop. 

The Voltage Drop is the reduction of the voltage in the circuit. 

As the current passes through a longer and longer conductor, more voltage is getting lost and that’s due the voltage drop developed across the resistance of the conductor and the wires.