Question 1 Part (a) Select all the correct statements about electric current. The electric current in a wire is a flow of electrons, while by convention we think of it as a flow of positive charges in the opposite direction. Question 2 The electric current flowing at a point along a conducting wire is the amount of charge flowing per unit time through the wire's cross-sectional area at that point. The flowing charges forming an electric current can be positive or negative charged particles. The electric current in a wire is a flow of positive charges. An electric current can flow in a wire in the absence of a potential difference along the wire. Part (b) Select all the correct statements. Ohm's law can be written in the form I = RAV. The resistance of a wire depends on the wire's resistivity, length, and cross-sectional area. All wires made of the same material at the same temperature have the same resistance. Ohm's law can be written in the form AV = IR. The resistance of a wire depends only on the resistivity of the wire's material. Part (a) As the temperature of a conductor is lowered, its resistance typically... (select the best choice) Ostays the same O decreases and then increases increases increases and then decreases Odecreases

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.