Hand Crank Generator

When the hand crank is shaken by the hand, the motor generates current, and the current passes through the wire to light the bulb. The hand-cranked generator model fully demonstrates the process of current generation, which is conducive to our popular science study.

Electric Bell

The magnetic reaction of the current: When the power is turned on, the electromagnet has a current passing through it, which generates magnetism. The elastic piece under the hammer is sucked in so that the hammer hits the bell and makes a sound. At the same time, the circuit is disconnected, the electromagnet loses its magnetism, and the hammer is again Bounced back, the circuit was closed, and the electric bell repeated a continuous blow.

Fruit Battery Experiment

The chemical activity of copper flakes and zinc flakes is different. A chemical reaction occurs in the fruit acid to generate an electric current to light up the LED.

Ohm's law

Through the experimental phenomenon we guessed: the current size may be affected by both the

size of the voltage, but also by the size of the resistance, then we design studies to quantitatively

study the relationship between current size and voltage, resistance, we should study separately;

Value resistors replace a conductor or a circuit to explore the relationship between these three

physical quantities.

Solar Energy Generation

Place the experimental group under the sun, turn on the switch, and observe whether the motor is rotating. You can install blades for the motor. This will be more obvious. It can be seen from the experiment that the sunlight generates current through the solar panel to make the motor rotate. Solar energy is a clean energy and plays an important role in life.

Parallel Circuits

As shown in the figure, a parallel circuit is formed to analyze the flow of current; and eachswitch is closed to see the effect of each switch in the parallel circuit. The analysis finds out which part is the branch and which part is the trunk.

Electromagnet

As shown in Figure,the magnetic flux of the energized solenoid is compared before and after the core is inserted;

As shown in Figure,insert the metal core into the solenoid, then connect two electromagnets with different turns in series, energize and gradually change the current, observe the change in the number of attracting pins.

Amper's Force Investigation

Install as shown in the figure, turn on the switch to observe the direction of movement of the copper tube, change the positive and negative poles of the battery, turn on the switch again, observe the direction of movement of the copper tube, you can see the force of the energized copper tube in the magnetic field, when the current is changed In the direction, the force is different.

Oersted Experiment

As shown in Figure, place the wire along the N and S poles of the small magnetic needle above the small magnetic needle, then quickly close the switch and disconnect it quickly. Observe the reaction of the small magnetic needle at the moment of energization, then change the direction of the current through the wire, and then observe reaction of the small magnetic needle.