Question

reading check

1. describe what is resistance and how does it affect the flow of current?

reading check

1. list what are the four factors that affect resistance?

Explanation:

Resistance is the opposition to the flow of electric current. According to Ohm's Law ($V = IR$, where $V$ is voltage, $I$ is current, and $R$ is resistance), for a given voltage, higher resistance results in lower current (since $I=\frac{V}{R}$). The four factors affecting resistance are:

• Material: Different materials have different resistivities (e.g., copper has lower resistivity than rubber).
• Length ($L$): Resistance is directly proportional to length ($R\propto L$).
• Cross - sectional area ($A$): Resistance is inversely proportional to cross - sectional area ($R\propto\frac{1}{A}$).
• Temperature: For most conductors, resistance increases with temperature (some exceptions like semiconductors have a different behavior).

Answer:

Resistance is the opposition to current flow. By Ohm's Law ($I = \frac{V}{R}$), higher $R$ gives lower $I$ for fixed $V$. The four factors: material (resistivity), length, cross - sectional area, and temperature.