Final answer:
The electrical charge of a terminal, either positive or negative, which determines the flow of current is called polarity.
Step-by-step explanation:
The electrical charge of a terminal, either positive or negative, which determines whether current flows into or away from it is called polarity. Polarity refers to the direction of flow of electric charge and can be identified by the presence of positive or negative signs. For example, in a battery, the positive terminal has a positive charge, while the negative terminal has a negative charge.
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