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How is the voltage drop across a low resistance related to lead resistance?
- a)it contains contact resistance
- b)it depends on the magnitude of voltage drop
- c)it depends on the type of null detector used
- d)it does not contain any contact resistance
Correct answer is option 'D'. Can you explain this answer?
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How is the voltage drop across a low resistance related to lead resist...
The voltage drop measured across a low resistance does not contain any contact and lead resistances of the components and is independent of it.
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How is the voltage drop across a low resistance related to lead resist...
Relation between voltage drop across low resistance and lead resistance:
Low resistance components like wires or conductors typically have negligible resistance compared to other components in a circuit. Therefore, the voltage drop across a low resistance is primarily determined by the resistance of the component itself and is not significantly affected by the lead resistance.
Explanation:
- Contact resistance: Lead resistance is often associated with contact resistance, which is the resistance at the point where two conductors make contact. However, in the case of low resistance components, the contact resistance is usually minimal and does not significantly impact the overall voltage drop across the component.
- Magnitude of voltage drop: The voltage drop across a low resistance is mainly determined by Ohm's Law, which states that V = IR, where V is the voltage drop, I is the current flowing through the component, and R is the resistance of the component. Since the resistance of the lead is much higher than the low resistance component, the voltage drop across the lead is negligible compared to the voltage drop across the low resistance component.
- Type of null detector: The type of null detector used in a circuit does not directly affect the voltage drop across a low resistance component. The null detector is typically used to measure the output or balance of a circuit and does not impact the voltage drop across individual components.
- No contact resistance: In conclusion, the voltage drop across a low resistance component is not significantly affected by lead resistance because the lead resistance is much higher and does not contribute significantly to the overall resistance in the circuit. Therefore, the voltage drop across a low resistance component is primarily determined by the resistance of the component itself.
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How is the voltage drop across a low resistance related to lead resistance?a)it contains contact resistanceb)it depends on the magnitude of voltage dropc)it depends on the type of null detector usedd)it does not contain any contact resistanceCorrect answer is option 'D'. Can you explain this answer?
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