Printing apparatus

A printing apparatus connectable to an external power supply, the external power supply having a plurality of voltage information and configured to output a voltage corresponding to any one of the plurality of voltage information, the printing apparatus comprising:

• a printing head configured to perform printing on a printing medium by electric power that is supplied from the external power supply;
• a resistor having an electric resistivity based on the printing head;
• a detector configured to detect a substantial voltage that is substantially supplied from the external power supply, a voltage output from the external power supply being lowered to the substantial voltage due to a voltage drop during the printing by the printing head in a case the resistor is energized with the electric power supplied from the external power supply;
• and
• a controller configured to:
• obtain the plurality of voltage information from the external power supply;
• decide, as a tentative voltage, a voltage corresponding to any one of the plurality of voltage information;
• request the external power supply to output the tentative voltage;
• energize the resistor with the tentative voltage that is supplied from the external power supply;
• decide the substantial voltage on a condition that a voltage corresponding to each of the voltage information obtained from the external power supply is supplied, based on a detection result of the detector during the energizing of the resistor;
• decide, as an electric power supply voltage, a voltage corresponding to any one of the plurality of voltage information, based on the substantial voltages;
• and
• request the external power supply to output the electric power supply voltage.