Chapter 22, Problem 71A

To determine

To draw: An electrical series circuit with given elements.

To find: The ammeter reading.

Answer to Problem 71A

An electrical series circuit with given elements is shown in Figure 1.

The ammeter reading is 2 A.

Explanation of Solution

Given:

Battery with voltage $V=90\text{V}$

Resistance of resistor, $R=45\Omega$

Ammeter to measure current.

Formula used:

According to Ohm’s law, the voltage-current relationship is

  $V=IR$

Calculation:

Series Circuit:

A circuit in which one or more electrical elements are connected one by one in a chain making a single path is a series circuit.

The current through all the elements is same and the total voltage is distributed to all the elements.

The series circuit for the given element specification is,

  

Figure 1

The direction of conventional current is from positive to negative terminal outside the battery and negative to positive terminal inside the battery.

The ammeter reading is,

  $I=\frac{V}{R}=\frac{90}{45}=2\text{A}$