En un circuito eléctrico se suministran 25 volts de tensión
y una corriente de 4 amperes.
Determina la resistencia en el
circuito

Resistencia = 6.25 Ohms

Explanation:

Dados los siguientes datos;

Voltaje = 25 voltios

Corriente = 4 amperios

Para encontrar la resistencia;

La ley de Ohm establece que a temperatura constante, la corriente que fluye en un circuito eléctrico es directamente proporcional al voltaje aplicado a través de los dos puntos e inversamente proporcional a la resistencia en el circuito eléctrico.

Matemáticamente, la ley de Ohm viene dada por la fórmula;

Dónde;

V representa el voltaje medido en voltios.

I representa la corriente medida en amperios.

R representa la resistencia medida en ohmios.

Sustituyendo en la fórmula, tenemos;

Resistencia = Voltaje/Corriente

Resistencia = 25/4

Resistencia = 6.25 Ohms

Ek = 196.2 [J]

Explanation:

The question concerns the KE kinetic energy.

That is, we must find the kinetic energy at the moment the cannon is fired and the kinetic energy of when the ball hits the ground after having fallen 20 meters.

At the moment when the ball is fired it is 20 meters above ground level. If the ground level is taken as the reference level of potential energy, where it is equal to zero, in this way when the ball is at the highest (20 meters) you have the maximum potential energy.

In this way, the energy in the initial state is equal to the sum of the kinetic energy plus the potential energy. As the energy is conserved this same energy will be present when the ball hits the ground, where the potential energy is zero and will have only kinetic energy.

The kinetic energy in the initial state can be easily calculated by means of the following equation.

Therefore the change in KE