The IR drop across a resistor means that there is a change in potential or voltage across the resistor. Is there any change in current as it passes through a resistor? Explain.
Electric current is like water flowing through a pipe. If the pipe has no leaks the water entering the pipe will be equal to the water leaving it.
Similarly, the current entering and leaving a resistance will remain the same, provided there are no short circuits. This is the Kirchhoff's current law.