In this paper, we discuss four types of electrical network circuits have been used for modeling amino acid sequences at the gross molecular level. The standard 20 amino acids have been partitioned into mutually exclusive partitions based on their chemical and structural properties and each partition is assigned a distinct electrical circuit. This enables the construction of electrical networks for representing any amino acid sequence. These networks have been analyzed to establish putative relationships between a network's electrical response and known behavior of protein sequences. To aid in the analysis of circuit response, we have also developed a unique visualization technique. Similar circuits have been used to model DNA/RNA sequences as well as non-biological strings which have applications in message encryption and computer security.