Edit in JSFiddle

var app = angular.module('myApp',[]);

<div ng-init="accordion=1">
	<h3 class="accordion" ng-class="{active:accordion==1}">
		<a href ng-click="accordion = 1">Section 1</a>
	</h3>
	<p class="accordion-content" ng-show="accordion==1">Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using</p>
	    
	<h3 class="accordion" ng-class="{active:accordion==2}">
		<a href ng-click="accordion = 2">Section 2</a>
	</h3>
	<p class="accordion-content" ng-show="accordion==2">It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. The point of using Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using</p>
	    
	<h3 class="accordion" ng-class="{active:accordion==3}">
		<a href ng-click="accordion = 3">Section 3</a>
	</h3>
	<p class="accordion-content" ng-show="accordion==3">There are many variations of passages of Lorem Ipsum available, but the majority have suffered alteration in some form</p>
</div>

*{
    font-family: Arial;
    font-size: 13px;
    line-height: 140%;
}
h3.accordion{
    margin: 0;
}
.accordion a{
    padding: 10px;
    background: #ddd;
    color: #333;
    text-decoration: none;
    font-weight: bold;
    display: block;
    margin-bottom: 1px;
}
.accordion-content{
    border: 1px solid #ddd;
    padding: 10px;
    margin: 1px 0;
}