Voltage,Current and Resistor formula
Introduction:
Ohm's Law was given by the German physicist Georg Simon Ohm(1787–1854). It expresses the connection between flow, opposition, and voltage across an electrical circuit.
This connection between current I, voltage V, and opposition R was given by the popular German researcher Georg Simon Ohm in 1827. He found in directing his examination that the result of the ongoing moving through the guide and the opposition of the guide decide the voltage drop over that guide in the circuit
Ohm’s Law Formulas:
There are basically three types of Ohm’s law formulas or equations.
Here
I is current,SI base unit ampere (A)
V is Voltage,SI base unit voltage(V)
R is resistance,SI base unit Ohm (Ω)
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Read Also:
Ohm’s Law Chart
Ohm’s Law
This law applies to electric to electric conduction through good conductors and may be stated as follows :
The ratio of potential difference (V) between any two points on a conductor to the current (I) flowing between them, is constant, provided the temperature of the conductor does not change.
In other words,
V I = constant
or V I = R
where R is the resistance of the conductor between the two points considered
Here
I is current,SI base unit ampere (A)
V is Voltage,SI base unit voltage(V)
R is resistance,SI base unit Ohm (Ω)
Resistance in Series(Circuit-1)
When some conductors having resistances R1, R2, and R3, etc. are joined end-on-end as in Circuit-1, they are said to be connected in series. It can be proved that the equivalent resistance or total resistance between points A and D is equal to the sum of the three individual resistances. Being a series circuit,it should be remembered that
- Current is the same through all the three conductors
- The voltage drop across each is different due to its different resistance and is given by Ohm’s Law
- The sum of the three voltage drops is equal to the voltage applied across the three conductors.
There is a progressive fall in potential as we go from point A to D as shown in Circuit 2
where R is the equivalent resistance of the series combination.
Here
I is current,SI base unit ampere (A)
V is Voltage,SI base unit voltage(V)
R is resistance,SI base unit Ohm (Ω)
G is Conducttance,SI base unit mho (℧)
As seen from above, the main characteristics of a series circuit are:
- The same current flows through all parts of the circuit.
- Different resistors have their individual voltage drops.
- Voltage drops are additive.
- Applied voltage equals the sum of different voltage drops.
- Resistances are additive.
- Powers are additive.
Resistance in Parallel Circuit
Three resistances, as joined in Circuit-3 are said to be connected in parallel.
In this case
- p.d. across all resistances is the same
- Current in each resistor is different and is given by Ohm’s Law
- The total current is the sum of the three separate currents.
Video:
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Frequently Asked Questions:
What is ohm's law?
The amount of current flowing through a conductor is directly proportional to the voltage applied to it. Whenever a voltage is applied to a conductor, an electric current flows through it.According to Ohm's law, when the voltage is high, more current flows through it and when the voltage is low, less current flows through it.The formula for Ohm's law is V=IR.
What is the Ohm's law formula?
The formula for Ohm's law is V=IR.Here,I is current,SI base unit ampere (A),V is Voltage,SI base unit voltage(V),R is resistance,SI base unit Ohm (Ω)
What is conductance?
Conductivity is a measure of how easily current can flow through a material. Conductivity is the inverse of electrical resistance expressed as G= 1/R.
Who is the father of Ohm's law?
Ohm's law was given by the German physicist Georg Simon Ohm (1787-1854). It expresses the relationship between current, resistance, and voltage across an electrical circuit.George Simon Ohm was able to determine the fundamental relationship between voltage, current, and resistance. Which is now known as Ohm's law.
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