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Resistance meaning in physical science
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In physical science, particularly in the field of physics and electrical engineering, "resistance" refers to the opposition that a material or device offers to the flow of electric current. It is a property of materials that quantifies how strongly they resist the passage of electricity.
Resistance is measured in ohms (Ω) and is governed by Ohm's Law, which states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) of the conductor. This relationship can be expressed with the formula:
\[ V = I \times R \]
In a broader sense, resistance can also be understood in other contexts beyond electricity, including:
1. **Mechanical Resistance**: In mechanics, resistance may refer to the opposing forces acting against motion, such as friction.
2. **Thermal Resistance**: In thermodynamics, it describes how a material resists the flow of heat.
3. **Fluid Resistance**: In fluid dynamics, resistance can refer to the drag or friction a fluid experiences when flowing over a surface.
Overall, resistance is a fundamental concept that describes how systems resist the flow or movement of energy, whether in the form of electricity, heat, or motion.
Resistance is measured in ohms (Ω) and is governed by Ohm's Law, which states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) of the conductor. This relationship can be expressed with the formula:
\[ V = I \times R \]
In a broader sense, resistance can also be understood in other contexts beyond electricity, including:
1. **Mechanical Resistance**: In mechanics, resistance may refer to the opposing forces acting against motion, such as friction.
2. **Thermal Resistance**: In thermodynamics, it describes how a material resists the flow of heat.
3. **Fluid Resistance**: In fluid dynamics, resistance can refer to the drag or friction a fluid experiences when flowing over a surface.
Overall, resistance is a fundamental concept that describes how systems resist the flow or movement of energy, whether in the form of electricity, heat, or motion.
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