.electric-potential1{width:233px; height:79px ;}
.electric-potential2{width:120px; height:110px ;}
.electric-potential-example2{width:200px; height:162px ;}
.electric-potential6{width:232px; height:210px ;}
.electric-potential3{width:120px; height:110px ;}
.electric-potential4{width:233px; height:55px ;}
.electric-potential5{width:156px; height:56px ;}
.electric-potential-example3{width:209px; height:163px ;}