Chapter 30, Problem 101A

(a)

To determine

To Find: The potential difference across the resistor.

Answer to Problem 101A

  $V=5.97\text{ Volts}$

Explanation of Solution

Given:

Voltage in silicon diode $\left(V_2\right) =0.7\text{ V}$ ,

Current $\left(I\right)=137\text{ mA}$

Voltage (power source) $(V_1) =6.67\text{ V}$

Formula used:

Potential difference = $V_2–V_1$

Calculation:

Potential difference,

  $\begin{array}{l}\left(V\right) =6.67-0.7\hfill \\ =5.97\text{ V}\hfill \end{array}$

Conclusion:

The potential difference is 5.97 V.

(b)

To determine

To Find: The value of resistor.

Answer to Problem 101A

  $R=43.57\Omega$

Explanation of Solution

Given:

Voltage in silicon diode $\left(V_2\right) =0.7\text{ V}$ ,

Current $\left(I\right)=137\text{ mA}$

Voltage (power source) $(V_1) =6.67\text{ V}$

Formula used:

  $R=\frac{V}{I}\Omega$ .

Calculation:

  $R=\frac{6.67-0.7}{137\times {10}^{-3}}\Omega$

  $R=43.57\Omega$

Conclusion:

The resistance across the circuit is $R=43.57\Omega$