As an example, consider a Thévenin source (voltage "VA", series resistance "RA") driving a resistor load "RL". Because of voltage division (also referred to as "loading") the voltage across the load is only "VA RL / ( RL + RA )". However, if the Thévenin source drives a unity gain buffer such as that in Figure 1 (top, with unity gain), the voltage input to the amplifier is "VA", and with "no voltage division" because the amplifier input resistance is infinite. At the output the dependent voltage source delivers voltage "Av VA = VA" to the load, again without voltage division because the output resistance of the buffer is zero. A Thévenin equivalent circuit of the combined original Thévenin source "and" the buffer is an ideal voltage source "VA" with zero Thévenin resistance.