Why Do We Use Ohm S Law

After reading this section you will be able to do the following.

Why do we use ohm s law. In combination with kirchhoff s laws you can use it to analyze most electric circuits and answer most problems you ll be given in electronics. The encyclopedia britannica notes that the law was initially coldly received but ohm started to receive honors for it in 1841. Identify ohm s law and discuss why it is important. Ohm s law states that the voltage or potential difference between two points is directly proportional to the current or electricity passing through the resistance and directly proportional to the resistance of the circuit the formula for ohm s law is v ir this relationship between current voltage and relationship was discovered by german scientist georg simon ohm.

If we know the values of any two of the three quantities voltage current and resistance in this circuit we can use ohm s law to determine the third. However what we are going to do is round the decimle to the nearest one thousandth. Ohm s law is the most important equation in electronics relating the electrical current to the voltage and the resistance to current flow in the circuit. ã this is how ohm s law works that s why its importance could not be underestimated.

Where i is the current through the conductor in units of amperes v is the voltage measured across the conductor in. This makes it very easy to apply ohm s law. In this first example we will calculate the amount of current i in a circuit given values of voltage e and resistance r. The units of measure used to define the parts of the law began to be developed after ohm s death as i will explain below.

Ohm s law does not only determine the voltage of a certain appliance but it can also verify the current or resistance. Ohm s law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Hi i m here to tell you how to use ohms law to figure out the resistance voltage or current of a circuit. So ohm s law and v ir do look the same at first sight.

Ohms law is a very common equation used in the field of electronics. Calculate the amount of electric current in a circuit using ohm s law. A voltmeter is a device equipped with probes that can be touched to two locations on a circuit to determine the electric potential difference across those locations. The ohm s law equation is often explored in physics labs using a resistor a battery pack an ammeter and a voltmeter.

Introducing the constant of proportionality the resistance one arrives at the usual mathematical equation that describes this relationship. 0 comment comment 12. The units we know that are associated with his law actually developed in succeeding years. ã if the voltage and resistance are given current can be measured if the current and voltage are present then the resistance can still be measured.