Hand battery

Handheld Battery - Customization of Science Museum Exhibitions, Campus Community Science Popularization Equipment, Source Manufacturer of Science Exhibitions Description and Introduction of Scientific Principles:

This exhibition items consist of three interactive demonstrations, where the metal plate materials used are copper and aluminum, copper and carbon steel, and copper and pure iron. By using multiple sets of comparisons, the audience was able to understand the chemical activity of different metals and the differences in the magnitude of the generated current, demonstrating the working principle of handheld batteries. In this exhibition items, the human body generates electric current because the human hands touch metals with different properties on the device. Taking the handheld battery made of aluminum metal plate and copper metal plate as an example, because there is a small amount of salt solution on the hand, aluminum reacts with chloride ions in the solution to produce aluminum trichloride, losing electrons and leaving them on the aluminum plate. The copper plate and aluminum plate are connected by wires, and the current on the aluminum plate flows to the copper plate, creating a current in the circuit. The hand placed on the copper plate also carries the same solution, in which hydrogen ions take away electrons from the copper plate and release hydrogen gas. As long as this reaction continues, there will be current in the circuit. In this way, the person's hand becomes part of the battery. When a copper plate and an aluminum plate are connected by a wire, electrons on the aluminum plate will move towards the copper plate through an ammeter, and the electrons in the wire will move in a directional manner, thereby generating an electric current. This actually constitutes a simple primary battery. The principle of hand batteries and voltaic batteries is the same, both are chemical batteries. The chemical batteries we use now, such as lithium batteries, button batteries, and dry batteries, are similar to the principle of voltaic batteries.

Main technical parameters of exhibits:

Dimensions (unit: m): 1.4 * 0.6 * 0.8 1. exhibits materials: ① Booth frame: 30 square tubes, enclosure board 1.2mm cold-rolled plate, surface painted ② Table top: Cambert board, thickness ≥ 10mm ③ Instruction board, graphic board: acrylic UV spray painting ④ Maintenance door: 1.2mm cold-rolled plate surface painted 2. Main configuration: ① Leakage switch: pole number: 2P+N; Release current: 16A; arc extinguishing medium: residual current circuit breaker; Breaking capacity: 6KA ② Solid state relay: SSR-4810 DA Rated parameters 10A 250V INPUT: 3-32VDC OUTPUT: 24-480VAC ③ DC motor: DC12V 1W 3. Energy requirement: AC220V 300W (standard three wire socket)

Principle explanation and demonstration video: