Relation Between Power Current And Resistance

Current sources are a bit difficult to visualize but one way you can think of it is a variable voltage source which increases or decreases the voltage until the current flowing from it is the desired value.

Relation between power current and resistance. If you reduce the resistance more current will flow and the resistor will get warmer because you ve increased the power. Which implies when power increases the resistance will also increase keeping current i constant. Mathematically it is expressed as. The first and perhaps most important the relationship between current voltage and resistance is called ohm s law discovered by georg simon ohm and published in his 1827 paper the galvanic circuit investigated mathematically.

The amount of resistance created by the load restricts the amount of current and inversely. In figure 5 there are a 100 ω load and two 0 5 ω wires connecting the load to the 120 v power supply. When resistance decreases power also reduces keeping current i constant. Both the formula mentioned above gives the relation between power and resistance.

Power p voltage v current i that law describes the relationship between power voltage and current in a conductor it means that if you measure the current flowing in the conductor and you measure the voltage difference from one end of the conductor to the other at the same instant then the product of voltage and current will be the rate at which heat is generated in the conductor at. Ohm defines the unit of resistance of 1 ohm as the resistance between two points in a conductor where the application of 1 volt will push 1 ampere or 6 241 10 18 electrons. In terms of a conceptual understanding the amount of power that can be transferred across a load or a resistance is directly affected by the resistance. The fundamental relationship between resistance voltage and current can be expressed using ohm s law.

This brings us back to georg ohm. And current that alternates back and forth through the circuit is known as alternating current or a c. Current that flows in a single direction is called direct current or d c. Power is equal to the voltage across a circuit element multiplied by the current flowing through it the unit for power is the watt w which is equal to a joule per second this relation can be found from the formula for power the power used or dissipated by a resistor can be found using the formula v ir.

The fundamental relationship between resistance voltage and current can be.