Ohm's Law

The Music Telegraph | Text 2019/01/29 [10:32]

Ohm's Law

The Music Telegraph| 입력 : 2019/01/29 [10:32]

▲ Ohm's law formula wheel

© Calculator.net

 

 

 

Ohm’s Law

 

 

Ohm’s Law:

1) Current follows voltage

2) Resistance is in the inverse/opposite direction of current

 

▲ © The Music Telegraph



▲ © The Music Telegraph




 

 

 

▲ Ohm's Law

© The Music Telegraph

 


e.g.

7V = I x 4Ω

  I = 7/4 = 1.75A

when Ω=154, then 7v/154Ω = 0.045A = 45mA ( 1000mA = 1A)

 

 

 

Power is the product of Current & Voltage

===> P = I x E

 

e.g. 

1st case: Ω=4 --> 1.75A x 7V = 12.25w

2nd case: Ω=154 --> 0.045A x 7V = 0.315w

 

 

 

 

 

▲ Resistor

: Common Resistance

: Inside of resistor --> Solid ceramic  

© The Music Telegraph



 

How to read resistor?

1) Number (1), (2) ==> Just copy down number that goes with that color

2) 3rd number ==> “Multiplier”: number of Zeros @ end of number

3) 4th ==> Tolerance

- Gold: +/- 5%

- Silver: +/- 10%

 

 

ex) Tolerance: 

100Ω Gold (95Ω~105Ω)

100Ω Silver (Ω90~110Ω)

 

 

0 Black BLK
1 Brown BRN
2 Red RD
3 Orange ORG
4 Yellow YEW
5 Green GRN
6 Blue BLU
7 Violet VIOL
8 Grey GRY
9 White WHT

 

 

ex) BRN | BLK | BRN | Silver

1       |   0     |    0    | +/- 10%

==> 100 Ω (Ω90~110Ω)

 

 

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