This article gives you a talk about why the wireless microphone can not be charged, and how to charge the wireless microphone? Corresponding knowledge points, I hope to help you, don't forget to collect this site oh. < / p > < h2 > the article directory list: < / h2 > < ul > < li style = 'margin - bottom: 3 px; list-style: none'>1. 8Classification of mathematical knowledge points and physical knowledge points in the second semester of grade.
Optical center: A special point on the main optical axis through which the direction of light propagation does not change. (The center of the lens can be considered as the center of light) focus: convex lens can make the light parallel to the main axis converge on the point of the main optical axis, which is called the focus of the lens, with "F" indicates the virtual focus: light parallel to the main optical axis after the concave lens becomes divergent, the opposite extension of the divergent light intersects on the main optical axis, this point is not the actual convergence point of the light, so called the virtual focus.
Learn to integrate knowledge. Classify the information and knowledge you need to learn and make a mind map or knowledge point card, which will make your brain and thinking clear and convenient to remember and warmLearn, master. At the same time, learn to connect new knowledge with what you already know, and constantly blend and improve your knowledge system. This promotes understanding and deepens memory. The following is I organized for you the "second volume of physics knowledge point summary Su teaching version", only for your reference.
If a transmission line is set up, aluminum wires are generally selected, because under the same conditions, aluminum resistance is small, reducing the power loss of the transmission line; And aluminum wire is relatively cheap. (4) Classification of fixed resistance: circuit symbol:. Variable resistor (rheostat) : circuit symbol. ⑴ Sliding rheostat: Construction: porcelainThis property. It does not change with the shape, state and position of the object. Unit of mass: In the International System of Units, the unit of mass is the kilogram. Other commonly used units are tons, grams, and milligrams. Quality measurement: Commonly used tools to measure quality are steelyard, desk scale, platform scale, electronic scale, day equality.
Length measurement Length measurement Length measurement is the most basic measurement, the most commonly used tool is the scale.
● The pressure knowledge water density: ρ water =0×10^3kg/m^3=1g/cm^31m3 water quality is 1t, 1cm3 of water has a mass of 1 gram. When using a balance to measure mass, one should measure it on the right. The density of the same substance also depends on the state (water and ice are the same substance, the state is different, the density is different).
Summary of the third physics knowledge point 1 Measurement length L: the main unit: meters; Measuring tools: scale; The measurement should be read to the next digit of the smallest scale; Light year is a unit of length. ⒉ Time t: Main unit: second; Measuring tool: clock; The stopwatch is used in the laboratory. 1 hour =3600 seconds, 1 second =1000 milliseconds. Mass m: The amount of material contained in the object is called mass.
The concept of gravity: the force exerted on an object by the attraction of the earth is called gravity. The object of gravity is: the earth. The magnitude of gravity is called weight, the gravity and mass of an objectIn direct proportion. Formula: G=mg Where g=8N/kg, it means that the weight of an object with a mass of 1kg is 8N. In the case of not very precise requirements, g=10N/kg is preferable. The direction of gravity: straight down.
Mouth decision one: "a focal (point) points virtual and solid, two focal (distance) points size; Virtual image is positive on the same side; The real image is turned on its side, and the far image becomes smaller." Decision 2: Things far away look small and near, things near look big and far,If the object is placed in the focus, the virtual image is amplified. The slide image is so big, the object is between one and two focal points, the camera shrinks you smaller, the object is twice the focal distance.
The propagation of sound requires a medium, a vacuum can not transmit sound (1) sound depends on all gases, liquids, solids as a medium to spread out, these as a medium called the medium.
Common materials: metal, graphite, human body, earth, acid, alkali and salt solution. Insulator: An object that is not good at conducting electricity. Common materials: rubber, glass, ceramics, plastics, oil, etc. Current and circuit current formation: determination of chargeMoving to form an electric current. Current direction: the direction of positive charge movement is specified as the direction of current. When the circuit is closed, the direction of the current outside the power supply is from the positive terminal of the power supply to the negative terminal through the electrical appliance.
The second chapter "Light phenomenon" review outline the linear propagation of light source: definition: objects that can emit light are called light sources. Categories: Natural light sources, such as the sun, fireflies; Artificial light sources, such as bonfires, candles, oil lamps, electric lights. The moon itself does not shine, it is not a source of light. Law: Light travels in a straight line in the same uniform medium.
Grade Two physics review outlineThe measurement of length The measurement of length is the most basic measurement, the most commonly used tool is the scale.
2, Oster experiment: live wireThere is a magnetic field around, the direction of the magnetic field is related to the direction of the current, this phenomenon is called the magnetic effect of the current. The phenomenon was discovered by the Danish physicist Oersted in 1820. This phenomenon shows that there is a magnetic field around the energized wire, and the direction of the magnetic field is related to the direction of the current. Magnetic field of an energized solenoid: The magnetic field of an energized solenoid is the same as that of a bar magnet.
3, electric power is a physical quantity that indicates the speed of consumption of electric energy, expressed by P, the unit is watt, referred to as watt, the symbol is W. Common units are kilowatts (KW). 1KW = 103W 1 horsepower = 735 watts. The definition of electric power can also be understood as: the electrical energy consumed by an electrical appliance in 1 second.
Wireless microphone why can't charge the introduction to talk about it here, thank you for taking the time to read the content of this site, more about wireless microphone how to charge? Why can't the wireless microphone charge the information don't forget to find in the site oh.