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In photovoltaics, current is the amount of charge flowing through a conductor in the form of electrons. Current is an important parameter for measuring and optimising the power output of photovoltaic systems. The unit of measurement for current is the ampere (A). To maximise the efficiency of photovoltaic systems, it is important to monitor and control the current flow. Too high a current can damage the system, while too low a current will reduce the energy yield. Overall, current is an important variable in photovoltaics that is closely linked to the power and safety of photovoltaic systems. By monitoring and controlling current flow, PV systems can be operated more efficiently and safely.