5. Write an algebraic equation relating the two currents in the rightmost branch, /, and 14. Write an algebraic equation relating the two currents in the leftmost branch, I, and Is- Current, Resistance, and Ohm's Law 1. Going back to the circuit you have set up in the PhET simulation, change the resistance of the resistor. Describe in words what happens to the current measured by the non-contact ammeter. 2. Change the voltage of the battery. Describe in words what happens to the current measured by the non-contact ammeter. Electrons are pushed around the circuit by the voltage of the power sources (the battery here, but other things can provide a so-called "motive force" like capacitors, generators, solar panels, and yes, even the diffusion across cell membranes.). Meanwhile the wires themselves are "crowded"; electrons moving through them "bang" into the structural atoms that make up the wire as well as other elec- trons. This prevents them from fully accelerating. At the macroscopic scale, we measure this as electrical resistance. The amount of current is proportional to the voltage supplied by the battery and inversely propor- tional to the resistance of the circuit. This relationship between the voltage across a section of circuit (AV), that portion's resistance R, and the current through the portion, I, is given by "Ohm's Law:" AV = IR (1)