BTW, changing a plug, replacing a wire, spay some paint does not count as tinkering in my book. When I tinker, I dig deep.

Where did I picked up the circuit theory know-how?

All Engineers took electrical classes somewhere along the academic route; We enter the classroom, went through the motion of listening to the teach/lecturer, collect all the handouts, do some tutorials and off we go to the exams… to return the knowledge in written form. Hopefully, some of these knowledge will residual in our brain. In my case, Ohms Law, power and summation of component value calculation stayed….

Lucky me, enough for tinkering and be dangerous.

Ohms Law

V = I · R

V is for voltage, V is the unitI

I is for current Ampere, A is the unit

R is for Resistance, Ω ohm us the unit.

From here, we can derive the following equations

I = V / R

R= V / I

Power

P = V · I

Where,

P for Power or Watt, W is the unit

V for Voltage across the component

I for current running through the component

Summation of Resistance

Series Connected Resistor,

R

_{total}in series = R

_{1}+ R

_{2}+ R

_{3}+ … + R

_{n}

Where,

R

_{total}is the resulted total

*Resistance*of the series connected resistors

R

_{1}, R

_{2}….Rn are the

*Resistance*of individual resistor

*~handy tips,*

When connecting same value resistor in series,

*Use This*

*--> R*

_{total}= R_{individual}x Pieces of resistors

Parallel connected Resistor,

*R _{total} = ((R_{1})^{-1} + (R_{2})^{-1} + (R_{3})^{-1} + …. + (R_{n})^{-1})^{-1}*

Where,

R_{total} is the resulted total *Resistance* of the connected resistors

R_{1}, R_{2}….Rn are the *Resistance* of individual resistor

~handy tips

When connecting identical value Resistor in parrallell

*R*

How to use them?

_{total}= R_{1 }/ pieces of resistor- Ohm’s Law enable us to figure out how much voltage is across the component and how much current going through the component.

- We use this as the minimum required ratings, i.e. current, voltage and watt rating of the components. *PS* For Power rating, give it at least a double,I triple when I have the chance.

- Summation of resistor allow us to add/reduce R
_{total}in the circuit. By changing the R_{tota}l, when use with Ohm’s Law, we can figure out how to adjust the current and voltage of the circuit and/or components. Which is an essential know-how for tinkering.

## No comments:

## Post a Comment