Electronics and Communication Engineering - Electronic Devices and Circuits - Discussion

Discussion Forum : Electronic Devices and Circuits - Section 1 (Q.No. 10)

Electronic Devices and Circuits

10.

In the circuit of figure the function of resistor R and diode D are

to limit the current and to protect LED against over voltage

to limit the voltage and to protect LED against over current

to limit the current and protect LED against reverse breakdown voltage.

none of the above.

Answer: Option

Explanation:

Resistance limits current and diode is reverse connected and therefore protects LED against reverse breakdown.

Discussion:

14 comments Page 1 of 2.

Abi said: 3 years ago

How it works? Please explain.

(1)

Preman said: 7 years ago

How the symbol of variable resistance (potentiometer) becomes a resistor? and why the symbol of LED is wrong?

Anyone explain this in clear.

Dileep reddy said: 7 years ago

What is reverse break down?

Reena said: 7 years ago

Is this zener diode or else?

(1)

Sandeep said: 8 years ago

I am not understanding that how to diode conducting under more than breakdown v/g because diode work in the forward bias.

Sandeep said: 8 years ago

Agree @Aman.

Ali Waqas said: 9 years ago

If the input voltage is dangerously increased (up to breakdown voltage) then diode will start conducting and thus be protecting the LED.

Ruchi said: 9 years ago

The gain in cc mode is 1/(1- a).

Kalakal said: 9 years ago

I accept your point @Aman.

Bhagya sri said: 9 years ago

Can anyone please give little more clarification to this question?

(1)

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