Question 234: Semiconductors and Logic Gates

Question

The circuit contains two diodes each with a forward resistance of 50$$\Omega$$ and with infinite reverse resistance. If the battery voltage is 6V, the current through the 120$$\Omega$$ resistance is ____________ mA.

Accepted Answer

Given, forward resistance, R
1
= 50 $$\Omega$$
Reverse resistance, R
2
= infinity
Battery voltage = 6V
According to circuit diagram,
In this case, diode D
1
is forward biased, whereas diode D
2
is reverse biased.
So, D
2
will act as open circuit.
$$6 - 50I - 130I - 120I = 0$$
$$ \Rightarrow 6 = 300I$$
$$ \Rightarrow I = {6 \over {300}} = {1 \over {50}}$$
$$ = {2 \over {100}} = 0.02$$ A = 20 mA
Hence, current through 120 $$\Omega$$ = 20 mA

Semiconductors and Logic Gates

The circuit contains two diodes each with a forward resistance of 50$\Omega and with infinite reverse resistance. If the battery voltage is 6V, the current through the 120\Omega$ resistance is ____________ mA.

Choose the correct answer: