The open circuit voltage of a solar panel is 800 MV and the short circuit current is 40 ma If the battery board is connected with a resistor of 20 ohm to form a closed circuit, its terminal voltage is A.0.1V B.0.2V C.0.3V D.0.4V

The open circuit voltage of a solar panel is 800 MV and the short circuit current is 40 ma If the battery board is connected with a resistor of 20 ohm to form a closed circuit, its terminal voltage is A.0.1V B.0.2V C.0.3V D.0.4V

Choose D
Internal resistance = 800 / 40 = 20 Ω
So the EMF is divided equally with the external resistance

The open circuit voltage is 80 mV and the short circuit current is 40 ma
If the battery board is connected with a resistor of 20 ohm to form a closed circuit, its terminal voltage is
A.0.1V B.0.2V C.0.3V D.0.4V
(note that the open circuit voltage is 80 mV)

0.0727V

University circuit about open circuit voltage and short circuit current
As shown in the figure, calculate the open circuit voltage and short circuit current of AB terminal,

Open circuit voltage UAB = 5-3 = 2V,
Short circuit current IAB = (5-3) / 4 = 0.5A

The actual open circuit voltage and short circuit current are different from those in theory

In fact, the open circuit voltage also has current. It also radiates electromagnetic wave. The short circuit current is not infinite in theory, but has specific value. Because there is resistance