Question

What is the opposition to the flow of an electric charge called?

Answer 1

Answer:

Resistance.

Explanation:

The resistance of a conductor measures how much resistant it is to a flow of charge. Since the current is the flow of charge, its measure in a circuit tell us how much resistance there is.  Thus, for a given voltage lower the current in the circuit, greater the resistance. This relation is summarized by Ohm's Law:

$V =IR$

where $V$ is the voltage across the circuit, $I$ the current, and $R$ is the resistance.