Which of the following will $NOT$ be observed when a multimeter (operating in resistance measuring mode) probes connected across a component are reversed?
- AMultimeter shows $NO$ deflection in both cases i.e. before and after reversing the probes if the chosen component is a capacitor.
- BMultimeter shows a deflection, accompanied by a splash of light out of the connected component in one direction and $NO$ deflection on reversing the probes if the chosen component is an $LED$.
- CMultimeter shows $NO$ deflection in both cases i.e. before and after reversing the probes if the chosen component is a metal wire.
- DMultimeter shows an equal deflection in both cases i.e. before and after reversing the probes if the chosen component is a resistor.
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Similar Questions
Assertion: $A$ $p-n$ junction with reverse bias can be used as a photo-diode to measure light intensity.
Reason: In a reverse bias condition,the current is small but is more sensitive to changes in incident light intensity.
Reason: In a reverse bias condition,the current is small but is more sensitive to changes in incident light intensity.
Given below are two statements: one is labeled as Assertion $A$ and the other is labeled as Reason $R$.
Assertion $A:$ Photodiodes are used in forward bias usually for measuring the light intensity.
Reason $R:$ For a $p-n$ junction diode, at applied voltage $V$, the current in the forward bias is more than the current in the reverse bias for $|V_z| > |V| \geq V_0$, where $V_0$ is the threshold voltage and $V_z$ is the breakdown voltage.
In the light of the above statements, choose the correct answer from the options given below.
Assertion $A:$ Photodiodes are used in forward bias usually for measuring the light intensity.
Reason $R:$ For a $p-n$ junction diode, at applied voltage $V$, the current in the forward bias is more than the current in the reverse bias for $|V_z| > |V| \geq V_0$, where $V_0$ is the threshold voltage and $V_z$ is the breakdown voltage.
In the light of the above statements, choose the correct answer from the options given below.
The figure shows $2$ $LEDs$ that can be used as a polarity detector. Applying a positive source voltage results in a green light,while negative supplies result in a red light. Packages of such combinations are commercially available. Find the resistor $R$ to ensure a current of $20 \ mA$ through the $ON$ diode for the configuration. Both diodes have a reverse breakdown voltage of $3 \ V$ and an average turn-on voltage of $2 \ V$. The source voltage is $8 \ V$. Find $R$ in $\Omega$.
Difficult
View SolutionWhich one of the following symbols represents a photodiode?
Which of the following statements is $NOT$ correct in the case of an $LED$?
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