Chapter 23, Problem 99A

To determine

To Write:A problem which can be solved using Ohm’s law for a circuit with $R=4\text{k}\Omega$ .

Explanation of Solution

Introduction:

Ohm’s law: It relates the current, voltage and resistance. According to this law, the voltage in a circuit is directly proportional to current or the ratio of voltage and current is constant for a resistor.

Mathematically, Ohm’s law is given as,

  $V=IR$

Where, $V$ is applied voltage, $I$ is current and $R$ is resistance.

The question can vary with different data.

One of the problems can be, “A circuit is being constructed which have a $4\text{k}\Omega$ resistor. If the source voltage is 8 V, find the current in the circuit.”

So, from Ohm’s law

  $I=\frac{V}{R}=\frac{8}{4\times {10}^3}=2\text{mA}$

Here infinite number of questions are possible by changing the source voltage.

Conclusion:

Therefore, the problem can be, “A circuit is being constructed which have a $4\text{k}\Omega$ resistor. If the source voltage is 8 V, find the current in the circuit.”