Question

assuming that the two diodes D1 and D2 used in electric circuit shown in figure are ideal find out the value of the current flowing through 1 ohm resistance.....​

Answer 1

The value of current flowing through a 1-ohm resistor is 2 Ampere.

Given:

As shown in the diagram,

• D1 and D2 are two diodes
• D1 is forward bias
• D2 is reversed bias
• 3 resistors are used R1 = 2 ohms, R2 = 2 ohms, and R3 = 1 ohm
• v = 6V

To Find:

The value of current flowing through a 1-ohm resistor

Solution:

D2 is reverse biased, hence no current would be flowing through it

Thus net resistance R = R3 + R1

= 1 + 2

= 3 ( not 1+2+2=5 )

Current (I) = V / R

= 6 / 3

= 2

Hence, the value of current flowing through a 1-ohm resistor is 2 Ampere.

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Answer 2

We can see in the diagram that D1 and D2 are two different diodes.

According to the symbols, D1 is a forward bias diode and D2 is reversed bias.  

R1 = 2 ohms

R2 = 2 ohms

R3 = 1  ohm

V = 6V

We have to find the value of the current flowing through R3.

Since D2 is reversed bias, no current would be flowing through it.

Therefore, the net resistance becomes, R = R3 + R1

= 1 + 2

= 3

Now, we know that current = voltage / resistance

Therefore, I = V / R

= 6 / 3

= 2

The correct answer to this question is 2 Amperes.