A power supply has a fixed output voltage of 12.0V , but you need V_t= 2.8V outp

Question

A power supply has a fixed output voltage of 12.0V , but you need V_t= 2.8V output for an experiment. Using the voltage divider shown in the figure, what should be if is 14.9ohm ? What will the terminal voltage V_t be if you connect a load to the 2.8V output, assuming the load has a resistance of 7.0ohm ?

A power supply has a fixed output voltage of 12.0V , but you need V_t= 2.8V output for an experiment. Using the voltage divider shown in the figure, what should be if is 14.9ohm ? What will the terminal voltage V_t be if you connect a load to the 2.8V output, assuming the load has a resistance of 7.0ohm ?

Explanation / Answer

R2/(R1+R2)=VT/(12-V) so 7/(14.9+7)=2.8/(12-V) so V=3.24

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