on what factors the resistance of a resistor depends
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There are four factors affecting resistance which are Temperature, Length of wire, Area of the cross-section of wire and nature of the material.
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The resistance of the resistor depends on the following factors.
1. Material of the resistor
- Different types of materials have differences in their abilities to let electrons flow.
- This is called the resistivity of the material and it affects the resistor's resistance.
2. Length of the resistor
- The resistance and length of the resistor are directly proportional.
- As the length increases, the electrons will have to travel more and the current flow takes time.
- Thus, as the length increases, resistance increases, and vice versa.
3. Thickness of the resistor
- The resistance and thickness of the resistor are inversely proportional.
- As the area within the resistor increase, the electrons will have more space to move about, and their collision decreases.
- This allows easy current flow.
- Therefore, as the thickness increase, resistance decreases and vice versa.
4. Temperature changes
- Resistance and temperature are directly proportional.
- As temperature increases, particle velocity increases, and their collision increases.
- This will restrict the electron flow.
- Thus, as temperature increases, resistance increases, and vice versa.
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