Washing machine and method of controlling washing machine

A method of controlling a washing machine including a tub in which water is accommodatable, a water level sensor configured to measure a water level of water accommodated in the tub, a rotatable drum in the tub and in which laundry is accommodatable, a motor configured to rotate the drum based on a driving current applied to the motor, a current sensor configured to detect the driving current applied to the motor, and at least one processor, the method comprising:

• by the at least one processor,
• with laundry accommodated in the drum,
• rotating, by the motor, the drum before water is supplied to the tub to perform a dry laundry agitation and detecting a dry laundry current value corresponding to the driving current detected by the current sensor during the dry laundry agitation,
• supplying water to the tub after the dry laundry agitation to perform a first supply of water,
• rotating, by the motor, the drum after the first supply of water to perform a first wet laundry agitation and detecting an amount of change of the water level measured by the water level sensor during the first wet laundry agitation,
• rotating, by the motor, the drum after the first wet laundry agitation to perform a second wet laundry agitation and detecting a wet laundry current value corresponding to the driving current detected by the current sensor during the second wet laundry agitation;
• and
• identifying a material of the laundry based on the dry laundry current value, the amount of change of a water level, and the wet laundry current value.