Transmitter course courseware The principle of radio receiving and transmitting is that the transmitter sends out current of different frequency and wavelength according to the requirements of...
Features: This series of products combines physical science, energy utilization and spatial thinking perfectly into a multifunctional and visualized educational toy, which is an educational...
Experimental principle: This is a typical switch circuit. The battery provides power. The switch controls the on/off of the current. When the switch is turned on, the switch current flows...