0.25 mm2 copper core cable. According to the laws of electrical transmission and distribution and the parameter theory of cable and wire manual, the design calculation shows that the safe carrying capacity of each square millimeter of copper core cable is 6 amps, and that current consumption per kilowatt hour is 2 amps. , and consumption of 0.75 kilowatts. The electric current is 1.5 amps, so using 0.25 square millimeters of copper wire can meet the power of 0.75 kilowatts.
Since the resistance of the iron coil is greater than the resistance of the copper coil, replacing the copper coil with an iron coil will increase the resistance in the circuit, thereby reducing the current in the circuit and making the bulb glow dimmer, so A This does not answer the meaning of the question;
Because the factors that affect the size of the induced current include the namenumber of turns of the coil, the strength of the magnetic field, and the rotation speed of the coil, you can increase the number of turns of the coil and use a more powerful magnet, increase the rotation speed of the coil to increase the size of induced current, therefore, BCD conforms to the meaning of; the question.
Then choose BCD.