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**1**of**2**•**1**, 2## Calculating the Resistance

on Wed Aug 29, 2018 2:45 pm

**The Resistance**

Measure of the opposition to the Current flow in an electric current

In Ohm's Law Resistance is represented by letter "R" and measured in ohm or the Greek Symbol omega "Ω".

The Resistance in the circuit is directly proportional to the voltage and inversely proportional to the current.

In Mathematical Equation:

R=V/I

Where;

R= resistance

V= voltage

I= current

in the good example again is the water tank where the water flow is the current and the resistance is the size of the water pipe.

The higher the resistance, the lower the current flow.

The lower the resistance, the higher the current flow

Example in Calculating the Resistance

1. Calculate the resistance of an iron filament if it operates on 230 V supply and draws a current equal to 2 A.

Given:

V= 230 V

I= 2 A

R=?

Solution:

R= V/I

R= 230 V/ 2 A

R= 115 Ω

2. Calculate Resistance for 8 V with 0.004 A.

Given:

V= 8 V

I= 0.004 A

R= ?

Solution:

R= V/I

R= 8 V/ 0.004 A

R= 2000 Ω

## Re: Calculating the Resistance

on Wed Sep 05, 2018 1:25 pm

Can we measure resistance in a live circuit?

## Re: Calculating the Resistance

on Wed Sep 05, 2018 2:51 pm

kc wrote:What affects the resistance?

Well if it comes to affecting the resistance there are four

1. The main resistivity of conductor.

2. length of the conductor.

3. Cross-sectional area of the conductor.

4. Temperature

## Re: Calculating the Resistance

on Thu Sep 06, 2018 12:53 pm

What is the main role of resistance in a circuit?

## Re: Calculating the Resistance

on Fri Sep 07, 2018 7:47 am

Pinkeroo wrote:What is the main role of resistance in a circuit?

The main function of resistors in a circuit is to control the flow of current to other components. Take an LED (light) for example. If too much current flows through an LED it is destroyed. So a resistor is used to limit the current.

## Re: Calculating the Resistance

on Fri Sep 07, 2018 7:48 am

kc wrote:What does it mean to have low resistance?

On ecig device, there appears warning sign displaying “Ohms Too Low” or “Low Atomizer”. Under such situation, the power supply of the mod is not normal and the atomizer cannot work.

As a resistance measuring index term, for example, low resistance/low ohm, ultra low resistance/ultra low ohm.

Resistance is the most important parameter index, it has influences on several aspects such as the taste, vapor, mod.

Normally, low resistance can be interpreted in two ways: a. “low resistance” often mentioned by vapers (huge vapor low resistance coil)

## Re: Calculating the Resistance

on Fri Sep 07, 2018 7:49 am

kc wrote:Can we measure resistance in a live circuit?

You can measure the voltage and the current of a live circuit and use those figures to calculate the resistance (Ohm's Law), but you can't actually measure the resistance of a live circuit. For a number of reasons, you need to turn the power off and measure the resistance of individual pieces of the circuit.

## Re: Calculating the Resistance

on Fri Sep 07, 2018 7:49 am

kc wrote:How can I measure resistance in a circuit?

Resistance on your electronic circuit is measured in ohms, represented by the Greek letter Omega (Ω). Measuring resistances is similar to measuring voltages, with a key difference: You must first disconnect all voltage sources from the circuit whose resistance you want to measure.

## Re: Calculating the Resistance

on Fri Sep 07, 2018 7:51 am

kc wrote:What affects the resistance?

The flow of charge through wires is often compared to the flow of water through pipes. The resistance to the flow of charge in an electric circuit is analogous to the frictional effects between water and the pipe surfaces as well as the resistance offered by obstacles that are present in its path. It is this resistance that hinders the water flow and reduces both its flow rate and its drift speed. Like the resistance to water flow, the total amount of resistance to charge flow within a wire of an electric circuit is affected by some clearly identifiable variables.

## Re: Calculating the Resistance

on Fri Sep 07, 2018 7:51 am

nyella wrote:why do I need to measure the resistance?

Resistance is the measure of difficulty electrons have in flowing through a particular object. It is similar to the friction an object experiences when moving or being moved across a surface. Resistance is measured in ohms; 1 ohm is equal to 1 volt of electrical difference per 1 ampere of current (1 volt/1 amp).

## Re: Calculating the Resistance

on Fri Sep 07, 2018 8:31 am

janaenae wrote:kc wrote:What does it mean to have low resistance?

On ecig device, there appears warning sign displaying “Ohms Too Low” or “Low Atomizer”. Under such situation, the power supply of the mod is not normal and the atomizer cannot work.

As a resistance measuring index term, for example, low resistance/low ohm, ultra low resistance/ultra low ohm.

Resistance is the most important parameter index, it has influences on several aspects such as the taste, vapor, mod.

Normally, low resistance can be interpreted in two ways: a. “low resistance” often mentioned by vapers (huge vapor low resistance coil)

How can you be so sure on your answer? it's too complicated, can you make it more simple?

## Re: Calculating the Resistance

on Fri Sep 07, 2018 8:47 am

How can we calculate the internal resistance inside a battery?

## Re: Calculating the Resistance

on Fri Sep 07, 2018 8:52 am

How is your topics, including voltage and current can be of great help sa topic na Kircchoff's Laws?

## Re: Calculating the Resistance

on Fri Sep 07, 2018 9:05 am

White wrote:How can we calculate the internal resistance inside a battery?

We can calculate the internal resistance if we take readings of the open-circuit voltage and the voltage across the battery's terminals with a load attached.

## Re: Calculating the Resistance

on Fri Sep 07, 2018 9:07 am

nyella wrote:why do I need to measure the resistance?

so that we know how to control the flow of the current .

## Re: Calculating the Resistance

on Fri Sep 07, 2018 9:26 am

White wrote:How is your topics, including voltage and current can be of great help sa topic na Kircchoff's Laws?

Because yung voltage and current are a part of kirchoff's Law, At yun din ata anf kinocompute dun sa kirchoff's law.

## Re: Calculating the Resistance

on Tue Sep 11, 2018 8:44 am

Low resistance in a circuit means there will be high current because the resistance resist the current flow in a circuit. Low resistance can cause circuit troubles.kc wrote:What does it mean to have low resistance?

## Re: Calculating the Resistance

on Tue Sep 11, 2018 8:51 am

janaenae wrote:Pinkeroo wrote:What is the main role of resistance in a circuit?

The main function of resistors in a circuit is to control the flow of current to other components. Take an LED (light) for example. If too much current flows through an LED it is destroyed. So a resistor is used to limit the current.

Yes that's right. And also if there is no resistance in a circuit, the uncontrolled current flow may destroy not just a component like the LED but also the whole circuit.

## Re: Calculating the Resistance

on Tue Sep 11, 2018 8:55 am

Admin wrote:White wrote:How is your topics, including voltage and current can be of great help sa topic na Kircchoff's Laws?

Because yung voltage and current are a part of kirchoff's Law, At yun din ata anf kinocompute dun sa kirchoff's law.

The Ohm's Law formulas is the one related in using the Kirchoff's Law.

## Re: Calculating the Resistance

on Tue Sep 11, 2018 9:12 am

Hi admin, curious lang ako, do you know who discovered resistance?

## Re: Calculating the Resistance

on Tue Sep 11, 2018 12:25 pm

Pinkeroo wrote:Hi admin, curious lang ako, do you know who discovered resistance?

Georg Simon Ohm discovered the Resistance

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