When a metallic wire is connected to a battery
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Current is taken to be flowing from negative terminal to positive terminal.
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Electrons flow from negative terminal to positive terminal.
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Electrons flow from positive terminal to negative terminal.
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Current is taken to be flowing from negative to negative and positive to positive terminal.
When a metallic wire is connected to a battery, electrons (negatively charged) flow from the negative terminal to the positive terminal - this is the actual particle flow. Conventionally, current is defined as flowing from positive to negative, opposite to electron flow. Option A incorrectly states the conventional direction, Option C reverses electron flow, and Option D describes an impossible scenario. The actual physical flow of electrons is from negative to positive terminal.