Therefore, the lower the impedance, the more current flows through the speaker. Similarly, if a speaker has low resistance (impedance), more current (flowing from your amplifier) will pass through the speaker and vice-versa. If a hose has a narrow opening (high resistance), less water will flow through it, and if the hose has a bigger opening (low resistance), more water will flow through it.
To understand what impedance means, think of a speaker as a hose and water that flows through it as electric current (audio signals).
Measured in ohms, this is another critical specification that you should take a note of.