you have several wires made from different Ohmic materials with different lengths different radii r, and different resistivities p, and you perform an experiment in which Du connect wires in series with a power supply with a varíable emf and measure the urrent I and the potential difference V across the wires. Then you obtains a linear elation between: O a. the current and the length of the wire using a power supply with a fixed emf and wires from the same material with equal radius. O b. the resistivity and I using wires from different materials with equal lengths and radii and fixed emf of the power supply. O c.V and I using wires with equal length and made from different materials. O d. the current and the inverse of the resistivity, using a fixed emf of the power supply and wires of equal length and radius made from different materials. O e. the potential V and the current la variable emf of the power supply and wires of equal length and radius but made from different materials.

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KVL and KCL

KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.

Sign Convention

Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.