PHYS 6B Lecture Notes - Lecture 11: Drift Velocity, Electric Field
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PHYS 6B Full Course Notes
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If area is bigger than the resistance is smaller. As temperature decreases so does resistance because at a higher temperature electrons move faster and bump into more things (bigger targets) Direction of current always defined for how positive ions flow. The electric field causes movement with drag force acting in the opposite direction. N: number of moving charges per unit volume. To have a current you need a conductor and to maintain that current it needs to be a closed circuit. For parallel: v is the same and current differs. Potential is a position function so it only matters where you are. Emf: electric motor force, means it sustains a potential difference of 1. 5 between the ends of the battery. I-clicker questions: two copper wires of different diameter are joined end to end, and a current flows in the wire combination.