A dishwasher includes: a tub; a sump configured to collect wash water sprayed into the tub; a spraying arm including: first and second channels configured to independently guide the wash water; and a plurality of spraying holes configured to spray the wash water supplied to each of the channels in preset directions; a supply pump configured to supply the wash water collected in the sump to the spraying arm, the supply pump including: an impeller; and a motor configured to drive the impeller; a flow path conversion unit configured to selectively supply the wash water to the first channel or the second channel; and a controller configured to cause the flow path conversion unit to selectively supply the wash water to the first channel or the second channel by controlling the operation of the motor based on a value of an electrical current flowing through the motor.