.electric-energy1{width:147px; height:110px ;}
.electric-energy-formula{width:240px; height:96px ;}
.electric-energy4{width:208px; height:210px ;}
.electric-energy3{width:150px; height:121px ;}
.electric-energy-problem{width:147px; height:110px ;}
.electric-energy-problem2{width:210px; height:212px ;}
.electric-energy5{width:150px; height:33px ;}