- 
                            Power supply (top element in the Meters section)
 
                            Click on the power supply icon, to turn the power on or off.
                            The color of the "light" in the power supply icon shows the state of the power supply (blue:
                            off, orange: on and red: short circuit 
                            Shift the slider to increase/decrease the voltage.
                         
                        - 
                            Sensors
 
                            The little round things on the meters are the sensors. You can drag them to the circuit
                            board.
                         
                        - 
                            Removing things
 
                            You can remove things from the circuit by dragging them outside the circuit area.
                         
                        - 
                            Editing resistor values
 
                            Select the resistor and click on it.
                         
                        - 
                            Switches
 
                            Select the switch and click on it.
                         
                        - 
                            Light bulbs
 
                            The light bulbs do not work in IE9 or earlier.
                         
                     
                
             | 
            
                
                    
                
                
                    
                     
                    
                
             |