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Ohm's Law ( Current, Voltage , and Resistance )

on Thu Aug 16, 2018 12:58 pm
Ohm's law
It defines the relationship between the voltage, current, and resistance in an electric circuit.
Where :
V = Voltage in volts
also called electromotive force, is a quantitative expression of the potential difference in charge between two points in an electrical field.

I = Current in amps
is a flow of electrical charge carriers, usually electrons or electron-deficient atoms.

R = Resistance in ohms
is the opposition that a substance offers to the flow of electric current.

The current is directly proportional to the voltage and inversely proportional to the resistance.

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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Mon Sep 03, 2018 1:14 pm
Below is a formula wheel for Ohm's Law relationships between P, I, V, and R. This is essentially what the calculator does, and is just a representation of the algebraic manipulation of the equations above. To use the wheel, choose the variable to solve for in the middle of the wheel, then use the relationship for the two known variables within the cross section of the circle.
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Mon Sep 03, 2018 1:46 pm
How many volts can kill a human?
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Mon Sep 03, 2018 4:09 pm
mau wrote:Below is a formula wheel for Ohm's Law relationships between P, I, V, and R. This is essentially what the calculator does, and is just a representation of the algebraic manipulation of the equations above. To use the wheel, choose the variable to solve for in the middle of the wheel, then use the relationship for the two known variables within the cross section of the circle.

The combination of Ohm's law and Joule's law gives us 12 formulas where 2 of the 4 variables are known. The wheel is a handy tool and memory jogger. To use it, simply choose the quadrant corresponding to the variable you want to calculate, then select the segment corresponding to the variables that you know the values of.
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Mon Sep 03, 2018 4:10 pm
mau wrote:How many volts can kill a human?

120 volts can kill ordinary, household, 120 volts AC electricity is dangerous and it can kill. Electrical current involves the flow of electrons and it's measured in amps.
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Tue Sep 04, 2018 12:20 pm
Can current kill an individual?
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Wed Sep 05, 2018 1:27 pm
Shaira G. wrote:Can current kill an individual?

No a current cannot kill an Individual, but a High Voltage can. No matter how high the current if the Voltage is Low, it won't make any pain on your body.
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Wed Sep 05, 2018 1:54 pm
how much voltage can a human body resist?
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Wed Sep 05, 2018 1:57 pm
how about oil, how can they can be converted into an electricity? can any answer this?
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Wed Sep 05, 2018 2:06 pm
DRAVEN wrote:how much voltage can a human body resist?

So what voltage can a person survive? Well if we’re considering death from heat, burning, and tampering with vital organs, it’s going to be between 100V and 10kV, as long as the power supply can actually produce the current that would kill you. An ideal, limitless power supply will always be deadly between 100V and 10kV, but in the real world there are always power limits.
This seems to imply that the human body can withstand any voltage, as long as the source of the potential difference (e.g. a difference in amount of charge) can’t produce currents high enough to burn you and disrupt your organs.
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Wed Sep 05, 2018 2:07 pm
Admin wrote:Ohm's law
It defines the relationship between the voltage, current, and resistance in an electric circuit.
Where :
V = Voltage in volts
also called electromotive force, is a quantitative expression of the potential difference in charge between two points in an electrical field.

I = Current in amps
is a flow of electrical charge carriers, usually electrons or electron-deficient atoms.

R = Resistance in ohms
is the opposition that a substance offers to the flow of electric current.

The current is directly proportional to the voltage and inversely proportional to the resistance.


If we're going to make a movie or a series about the relation ship of Volts, Ampere and Ohm, It would totally make a good story, Volt is a good parent to Ampere who pushes and pursue him to attain his goal, and Ohm is a bastard who makes the difficulties of Volt and Ampere.
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Wed Sep 05, 2018 2:08 pm
DRAVEN wrote:how about oil, how can they can be converted into an electricity? can any answer this?

Three technologies are used to convert oil into electricity:
Conventional steam - Oil is burned to heat water to create steam to generate electricity.
Combustion turbine - Oil is burned under pressure to produce hot exhaust gases which spin a turbine to generate electricity.
Combined-cycle technology - Oil is first combusted in a combustion turbine, using the heated exhaust gases to generate electricity. After these exhaust gases are recovered, they heat water in a boiler, creating steam to drive a second turbine.
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Wed Sep 05, 2018 2:11 pm
Admin! Very Happy Is Resistor a linear device?
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Fri Sep 07, 2018 7:48 am
Is resistance directly proportional to voltage?
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Fri Sep 07, 2018 7:49 am
Why does current decrease when voltage increases?
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Fri Sep 07, 2018 7:50 am
What is difference between potential and voltage?
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Fri Sep 07, 2018 7:51 am
How many watts are in a Volt?
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Fri Sep 07, 2018 7:53 am
Gel wrote:Admin!  Very Happy Is Resistor a linear device?
In an electric circuit, a nonlinear element or nonlinear device is an electrical element which does not have a linear relationship between current and voltage. A diode is a simple example. Examples of linear elements are resistors, capacitors, and air core inductors.
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Fri Sep 07, 2018 8:06 am
neil wrote:Is resistance directly proportional to voltage?
In the first version of the formula, I = V/R, Ohm's Law tells us that the electrical current in a circuit can be calculated by dividing the voltage by the resistance. In other words, the current is directly proportional to the voltage and inversely proportional to the resistance.
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Fri Sep 07, 2018 8:06 am
neil wrote:Why does current decrease when voltage increases?
The current required to carry a given power decrease when you increase the voltage because the power is the product of the current with the voltage and power factor. No, the Ohm's law is not violated since Ohm's law relates the voltage across between the ends of a conductor to the current through the conductor.
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Fri Sep 07, 2018 8:07 am
neil wrote:What is difference between potential and voltage?
If the electric potential difference between two locations is 3 volts, then one coulomb of charge will gain 3 joules of potential energy when moved between those two locations. Because electric potential difference is expressed in units of volts, it is sometimes referred to as the voltage.
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Fri Sep 07, 2018 8:08 am
neil wrote:How many watts are in a Volt?
Using Ohms law, you would multiply amperage times volts to get watts. For instance a 12 volt circuit drawing 2 amps would consume 24 watts of power (12*2=24). A 60 watt light bulb powered by 120 volts in a house would draw .5 amp of current (60/120= .5).
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Fri Sep 07, 2018 9:16 am
What relationship exists between current and resistance when voltage is kept constant?
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Fri Sep 07, 2018 9:19 am
What does voltage difference mean?
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Re: Ohm's Law ( Current, Voltage , and Resistance )

on Fri Sep 07, 2018 9:20 am
Jhejhe wrote:What relationship exists between current and resistance when voltage is kept constant?

In ohm's law ,V is directly proportinal to I keeping resistance constant. Thus V=IR. It means in order to increase current through the resistance voltage applied should be increased. However in power equation, P=VI such that V is inversely proportional to I. Here power is kept constant.
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