Vary the frequency using the slider and then rest the mouse on a circuit component to read the voltage.
You can also use JavaScript to plot the instantaneous voltages as functions of time or the rms current as a function of frequency.
<script language="JavaScript"> function voltage(){ document.Circuit.setDefault(40); document.Circuit.setShowGraph(true); document.Circuit.setImpedanceGraphType(false); document.Circuit.setACVoltage(100,true,false); document.Circuit.setAutoRefresh(true); } function current(){ document.Circuit.setDefault(40); document.Circuit.setShowGraph(true); document.Circuit.setImpedanceGraphType(true); document.Circuit.setACVoltage(100,true,false); document.Circuit.setAutoRefresh(true); } </script>