The major difference between a chemical and an electrical synapse is that in a chemical synapse, the nerve impulse is transmitted chemically via neurotransmitters, whereas in an electrical synapse a nerve impulse is transmitted electrically via channel proteins.
Chemical synapses use the release of chemical neurotransmitters to propagate signals from one neuron (presynaptic) to another (postsynaptic). The electrical synapses are specialised connections between neurons that facilitate direct ionic and small metabolite communication. Hence, the electrical synapses are very faster and are found in all nervous systems, especially in the human brain.