def Power_from_volt(self, V, R_Km, Dis_insul, Diameter_mm):
    As = ((np.pi * ((Diameter_mm / 1000) ** 2)) / 4)
    R = (((R_Km * Dis_insul) * As) / 1000)
    W = ((V ** 2) / R)
    return W
def Power_from_volt(self, V, R_Km, Dis_insul, Diameter_mm):
    As = ((np.pi * ((Diameter_mm / 1000) ** 2)) / 4)
    R = (((R_Km * Dis_insul) * As) / 1000)
    W = ((V ** 2) / R)
    return W