A classmate used the device shown in to explore the relationship between the heat generated by current passing through a conductor and the conductor resistance. Two flasks contain mass and temperature. (1) The control variable method and transformation method are used in the experiment, and the design basis of the experiment is Joule's law.

(2) As can be seen from the figure, two resistance wires are connected in series in the circuit, and the currents passing through the two resistance wires are equal;

(3) The experiment adopts a conversion algorithm, and the change of the thermometer indicates the heat generated by the conductor;

(4) According to Joule's law Q=I2Rt, when the current and the energizing time are the same, the greater the resistance, the more heat is generated; The resistance of copper wire in bottle A is less than that of Ni-Cr alloy wire in bottle B, and the heat released by the resistance wire in bottle A is less than that in bottle B after being electrified for a period of time, so it is observed that the indicated value of thermometer in bottle A is less than that in bottle B;

(5) The conclusion of this experiment is that the heat generated by the conductor is related to the conductor resistance under the same current and power-on time.

So the answer is: (1) control variable; Conversion; Joule's law; (2) equality; (3) through the change of thermometer; (4) less than; According to Joule's law Q=I2Rt, when the current and the power-on time are the same, the greater the resistance, the more heat is generated. (5) Under the same current and current time, the heat generated by the conductor is related to the conductor resistance.