what is current, voltage, resistance and ohm's law

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Current, Voltage, Resistance, Ohm’s law basics

                                                                       
                                      
                                          CURRENT:

• Current is a flow of electric charge in any cross-section area. OR  Flow of charge called current.
• It is denoted by  ‘I ’
• Unit of current is AMPERE
• Dimensional formula of the ampere is [M⁰L⁰T⁰A]

I =V/R

VOLTAGE:

•  voltage in which movement of charge take place
• It is denoted by  ‘V ’ 

• Unit of voltage is ‘volt ’ 
• One volt equals one joule per coulomb
• Dimensional formula of a volt is ML²/QT²

V = IR

RESISTANCE: 

 A resistance that opposes the flow of charge in any conductor

OR 

Resistance which have a tendency to resist the flow of charge.

one ohm is the equivalent of a one-kilogram meter squared per second cubed per ampere squared (1 kg times m. s. A ^-2. The ohm is also the equivalent of a volt per ampere (V/A)

Ohm has a dimension ML²T^-3I^-2 where M is mass, L is the length, T is time, and I is an electric current.

It is denoted by  ‘R ’

Resistance is a constant term

Unit of resistance is Ohm

R = V/I

Ohm's law: 

Ohm's law states that, in an electrical circuit, the current passing through most materials is directly proportional to the potential difference applied across them

Ohm law gives a relation between current and voltage and resistance, where resistance is constant.

According to Ohm law voltage is directly proportional to current

Mathematically,

                                                  

                                                  V ∝ I

On removing directly proportional sign a constant comes called resistance

V = IR 

 here, R is a constant

 

Now, for current

I = V/R

 For Resistance 

R = V/I

There are three forms of Ohm’s Law:

I = V/R 

 V = IR  

 R = V/I   

where: 

I = Current

V= Voltage

R= Resistance

1 ampere = 1 volt / 1 ohm

1 volt = 1 ampere × 1 ohm

1 ohm = 1 volt / 1 ampere

Thank you! if you've got any question associated with this basic information please comment or for additional topics comment, please comment