Chapter 14.1, Problem 4TY

Interpretation Introduction

Interpretation:

The voltage required to produce a power of $180\text{ mW}$ has to be calculated.

Concept Introduction:

Ohm’s law:

Ohm’s law states that the current, I (in ampere) flowing through the circuit is inversely proportional to the resistance, R (in ohm) and directly proportional to the potential difference, E (in volt) across the circuit.

$\text{I=}\frac{\text{E}}{\text{R}}$

Power:

The electric power, P, is the work done per unit time. The unit of power is watt $(\text{W)}$.

$\begin{array}{l}\text{Power = }\frac{\text{work}}{s}\\ =\frac{\text{E}·q}{s}\\ =\text{E }·\text{ I}\end{array}$

To Calculate: The voltage required to produce a power of $180\text{ mW}$