Power Resistance Voltage Current Relationship

So for this analogy remember.

Power resistance voltage current relationship. The relationship between voltage current and resistance forms the basis of ohm s law. For this reason the quantities of voltage and resistance are often stated as being between or across two points in a circuit. The amount of current in a circuit depends on the amount of voltage and the amount of resistance in the circuit to oppose current flow. By the same token if the resistance of the resistor does not change then if the voltage drops in value decreases the current also decreases.

In this analogy charge is represented by the water amount voltage is represented by the water pressure and current is represented by the water flow. In a linear circuit of fixed resistance if we increase the voltage the current goes up and similarly if we decrease the voltage the current goes down. When describing voltage current and resistance a common analogy is a water tank. There is a basic equation in electrical engineering that states how the three terms relate.

So power is the total measure of the amount of work done or the energy expended. Ohm s law states that voltage across a resistor is linearly proportional to the current flowing through it or v i r. Volt amp and ohm. Voltage v i x r 2 x 12ω 24v current i v r 24 12ω 2a resistance r v i 24 2 12 ω.

Voltage sources deliver power while resistors use power by dissipating it as heat. This can be arranged to say that current is inversely proportional to voltage or i v r. Dc power formulas voltage v in v calculation from current i in a and resistance r in ω. Power is the combination of current times the voltage.

P w v v i a v 2 v r ω i 2 a r ω ac power formulas the voltage v in volts v is equal to the current i in amps a times the impedance z in ohms ω. The other portion of ohm s law is p e x i. Ohm s law shows the relationship between voltage current and resistance. This is known as ohm s law.

It says that the current is equal to the voltage divided by the resistance or i v r. This means that if the voltage is high the current is high and if the voltage is low the current is low. If you assume i is constant and replace v with i r you get that power is proportional to resistance p i i r. Voltage is what comes out of the wall.

The p is power. Just like voltage resistance is a quantity relative between two points. Voltage is represented in equations and schematics by the letter v. The voltage is equivalent to the water pressure the current is equivalent to the flow rate and the resistance is like the pipe size.

V v i a r ω the power p in w calculation from voltage v in v and current i in a. The current is equal to the electromotive force of the source divided by the total circuit resistance. The relationship between the voltage across a resistor and the current through that resistor is linear. For the circuit shown below find the voltage v the current i the resistance r and the power p.