The open circuit voltage and short circuit current of the two terminal network are 10V and 2A respectively When the open circuit voltage of two terminal network is 10V and the short circuit current is 2a, it is equivalent to voltage source and the electromotive force is 0___ 5. The internal resistance is___

The open circuit voltage and short circuit current of the two terminal network are 10V and 2A respectively When the open circuit voltage of two terminal network is 10V and the short circuit current is 2a, it is equivalent to voltage source and the electromotive force is 0___ 5. The internal resistance is___

Internal resistance R = 10 / 2 = 5 Ω, open circuit voltage is electromotive force, so it is 10V 5 Ω

When we use Thevenin's theorem to calculate the equivalent resistance, what should we do if the short circuit current is zero?

The internal resistance is infinite, and the equivalent power supply voltage is open circuit voltage

Calculation of output power of power supply
A power adapter is marked with DC 15V, 3a. If it is connected to the LCD marked with DC12V, 3a, how about the power? If according to the formula, the resistance of the display should be 12 divided by 3 = 4 Ω, and then connected to the power supply, the working current will be greater than the output current 3a of the power supply, then the power consumption of the display will not increase, or the power of the display will remain unchanged, the voltage will increase, and the current will decrease

I don't know how to calculate it, but brother, you must have a problem with that calculation. "The resistance of the monitor should be 12 divided by 3 = 4 ohm", which is based on Ohm's law. But as far as I know, Ohm's law is only applicable to DC power supply, and your monitor is not a battery. Household power supply is AC power supply, The rated voltage is 220 v. when the monitor is connected to the power supply, the voltage will be reduced to the rated voltage of the monitor through the transformer. However, after the voltage is reduced to the rated voltage, how to calculate the power in the AC circuit? You'd better ask an expert about this, I really don't know how to answer... But generally, the display or power supply should be marked with rated power. These are accurate data obtained through accurate calculation. Generally, there is no need for artificial calculation. You might as well look carefully

How to calculate the output power of the power supply
Output Voltage Min.load Max.load Load Reg.Ripple & Noise
-12V 0.0A 0.5A ±10% 120mV P-P
+3.3V 0.5A 14.0A ±5% 50mV P-P
+5V 0.3A 25.0A ±5% 50mV P-P
+5Vsb 0.0A 1.5A ±5% 50mV P-P
+12V 1.0A 12.0A ±5% 120mV P-P
-5V 0.0A 0.5A ±10% 120mV P-
This is a power supply

12*0.5+3.3*14+5*25+5*1.5+12*12+5*0.5
Just calculate it