When measured by voltammetry, it can be obtained from ohm's law of closed circuit: u = e-IR；;

According to mathematical knowledge, the intersection of the image and the ordinate in the U-I image represents the electromotive force of the power supply; The slope of the image represents the internal resistance of the power supply;

As can be seen from the figure, e =1.45v; r= 1.45？ 1.000.60=0.69Ω;

When the output power of the power supply is known, when the internal and external resistances are equal, the output power of the power supply is the largest, and the maximum power P=E24r, so the maximum power P =1.4524× 0.69 = 0.76W;

So the answers are: 1.45, 0.69, 0.76.