Final answer:
The resistance of flow of electrons in a circuit is affected by the size of the wire, wire material, and temperature.
Step-by-step explanation:
The variables that affect the resistance of flow of electrons in a circuit include the size of the wire, the wire material, and the temperature.
The size of the wire affects resistance because a thicker wire has lower resistance compared to a thinner wire. This is because a thicker wire provides more space for the electrons to flow, reducing the chances of collisions and increasing the current.
The wire material also affects resistance. Different materials have different resistivities, which determine how easily they allow the flow of electrons. For example, copper has a lower resistivity than steel, so copper wires have lower resistance than steel wires of the same size.
Temperature plays a crucial role in resistance. As the temperature increases, the resistance of most conductors also increases. This is due to the increased vibration of the atoms in the conductor, which obstructs the flow of electrons.
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