Parallel Circuit Troubleshooting

In parallel circuits the applied voltage is the same across each parallel branch, and the current in each branch equals the applied voltage divided by the resistance of the branch.
In above circuit the current in each branch is the same because resistors are the same। In the circuit below one resistor changed value.

Why does Ammeter [A] read negative?
Answer: Because of orientation of Ammeter. If I connected + side of Ammeter [A] to plus side of the 5VDC source than meter would read positive but the "A" would be upside down.

In lower animation, which resistor failed?
Answer R2 resistance increased.