# Current-Voltage/ I-V Curve: explanation and use

The current-voltage (I-V) curve is generated during the flash test of a solar panel and depicts in a chart the relationship between electrical current intensity (I) and voltage (V).

## What are the technical parameters depicted in the I-V Curve?

Current intensity, expressed in amps, and voltage (V), expressed in volts, are the y-axis and x-axis in a graph depicting their relationship in bipolar electrical devices. In photovoltaics, the maximum current of a solar PV module is equivalent to resistance R (= V/I) of zero ohms in the circuit and is commonly referred to as the short circuit current(Isc). At this maximum point, the voltage V in the circuit is zero. Connecting the resistance, the voltage increases while the current intensity slightly decreases. Further increases of the resistance lead little increase in voltage but a current intensity of near zero. At maximum voltage, there is a break in the circuit, known as open circuit voltage (Voc). The I-V curve depicts these two extremes in a graph with Isc shown in the y-axis and Voc the x-axis.