electricity question

[Karate Chop]

Just a simple question, if u have an electric circuit that has a DC power supply, and you set it to 8 volts, u have an ammeter, lightbulb and variable resistor also in the circuit, does the current in the circuit change as the resistance changes, or is the current always constant?

[boaz]

i am not sure but due to the fact that you have a variable resistor and the ammeter is ideal, the current isn't constant. i think it is related to Ohm's law:
I=V/R

[Doc Al]

For a series circuit, the relationship between voltage (V) and current (I) is given by V = IR, where R is the total resistance. So if you change the resistance, the current will change accordingly.