Considering the definitipn of current, voltage, power, and Ohm's law,
The flow of electricity through an object, such as a wire, is known as current (I). Its unit of measurement is amps (A). So current is a measure of the speed at which the load passes through a given reference point in a specified direction.
The conductive force (electrical pressure) behind the flow of a current is known as voltage and is measured in volts (V) (voltage can also be referred to as the potential difference or electromotive force). That is, voltage is a measure of the work required to move a charge from one point to another.
Resistance (R) refers to the resistance or opposition that an element has to the passage of electric current. It is represented by the symbol Ω and indicates the resistance that an element offers to the passage of electricity.
This means that the greater the resistance to the passage of current, the lower the intensity or amount of electricity that passes through this conductor.
The resistance that is measured in ohms.
Ohm's law indicates that the current through a circuit is directly proportional to its voltage or voltage and inversely proportional to the resistance it presents.
Mathematically, Watt's law is expressed:
So if you want to find resistance, the expression for its calculation is:
In this case, you know:
Replacing:
Solving:
<u><em>R= 12.8 ohms</em></u>
<u><em /></u>
Habiba is right. The resistance is 12.8 ohms.
Learn more:
Answer:
I = (K+5)
Explanation:
Given :
J = k+5
Now selecting a thin ring in the wire of radius "r" and thickness dr.
Current through the thin ring is
dI = J X 2πrdr
dI = (K+5) x 2πrdr
Now integrating we get
I =
I = (K+5) 2π
I = (K+5) 2π
I = (K+5)
Answer:
(a) Explained below
(b)
(c) Yes
Explanation:
<u>Law Of Conservation Of Linear Momentum</u>
The total linear momentum of a system of particles or objects is conserved unless an external force is acting on the system. The formula for the momentum of a body with mass m and velocity v is P=mv. If there is a system of bodies, then the total linear momentum is the sum of the individual momentums
When objects collide and join together, the only final mass is the sum of all masses, all traveling at the same speed.
Our fullback runs at
. Two two 68-kg linebackers attempt to stop him, one at -2.0 m/s and the other at -4.0 m/s. The negative value is because the run against the positive direction, taken in the direction of the fullback.
(a) Before the event, there is a total linear momentum, computed as the sum of the momentums of each player as shown
After the collision, all the players keep joined in one single mass of.
They will move at a speed which will be computed below
(b) The final momentum of the system is
Since the linear momentum is conserved, the final speed is common to all of the players. Let's solve to find it
(c) Since the final speed of the players is positive, it means the touchdown was actually scored, the fullback moved forward across the goal line, the positive reference.