Resistivity is a material-specific property that measures how strongly a material opposes the flow of electric current. The resistance of a conductor is directly proportional to its resistivity. Materials with low resistivity (like copper) have lower resistance, while materials with high resistivity (like rubber) have higher resistance.
For most conductors (such as metals), resistance increases with an increase in temperature due to more frequent collisions between electrons and atoms. However, some materials, like semiconductors, may exhibit decreased resistance with increasing temperature.
A thicker wire has a larger cross-sectional area, which provides more space for the flow of electric current, reducing the resistance. Resistance is inversely proportional to the cross-sectional area.
If a component in a series circuit fails (e.g., if a bulb burns out), the entire circuit is interrupted, and current stops flowing through all components.
If a component in a series circuit fails (e.g., if a bulb burns out), the entire circuit is interrupted, and current stops flowing through all components.
An ammeter is connected in series with the circuit components to measure the current flowing through the circuit.
A voltmeter is connected in parallel with the component or section of the circuit across which the potential difference (voltage) is to be measured.
Circuit diagrams simplify the understanding of electrical circuits by using symbols to represent components and connections. They help in the design, analysis, and troubleshooting of circuits and are universally understood.
In a series circuit, all components are connected in a single path, so the same current flows through each component. In a parallel circuit, components are connected across the same two points, providing multiple paths for current to flow.
Ohm’s Law states that the potential difference across a conductor is directly proportional to the current flowing through it, provided the resistance remains constant. Mathematically, V=IR.
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