Multifunctional short circuit demonstrator

Abstract

The invention discloses a multi-functional short-circuit demonstrator, whose structure includes a demonstration board, a vertical board, a base and a melt tank, and is characterized in that: the demonstration board and various circuit elements and power sources arranged on the demonstration board to form a demonstration circuit, said The circuit components are electric keys, small light bulbs, fuses, and wires. The power supply is one of a storage battery, a student regulated power supply, and a voltage regulator. The middle section of the fuse is wrapped with one of restaurant paper, toilet paper, and aluminum foil. The two ends are exposed and clamped in the slots at the two ends of the fixing seat. The beneficial effects of the present invention are: (1) fix the demonstration board on the vertical board, visual image; (2) wrap one of restaurant paper, toilet paper, and aluminum foil paper in the middle section of the fuse, effectively prolonging the occurrence of short-circuit hazards (3) Easy to obtain materials and low cost; (4) Safe and reliable; (5) The overall structure is simple and easy to operate.

Description

Technical field: [0001] The invention relates to a physics teaching aid, in particular to a multifunctional short circuit demonstrator. Background technique: [0002] In physics, the direct connection of electric current with wires without passing through electrical appliances is called short circuit. Short circuit is divided into two types: power short circuit and partial short circuit. Power short circuit is the process of current flowing from the positive pole to the negative pole without passing through any electrical appliances (lamps, electric bells, resistors, etc.); partial short circuit is between two points in the circuit. One branch does not contain electrical appliances, and all the current flows through this branch without electrical appliances. When the power supply is short-circuited, there is only a small internal resistance of the power supply in the current loop, and the current is very large, and the power supply will be burned out after a long time; wh...

AI Technical Summary

Problems solved by technology

When the power supply is short-circuited, there is only a small internal resistance of the power supply in the current loop, and the current is very large, and the power supply will be burned out after a long time; when a partial short circuit occurs, the short-circuited appliance has no current passing through, and it is easy to burn other appliances

When a short circuit occurs in the circuit, the temperature of the wire will rise due to excessive current, which will cause damage to the machine or cause a fire in severe cases, so it must be avoided.

[0003] "Short circuit and its hazards" is an important but very abstract content in the part of junior high school physics and electricity. Although the textbook clearly introduces the concept of short circuit and its hazards, it does not Design relevant demonstration experiments, in order to let students have a deep understanding of the hazards of short circuit, teachers usually use self-made teaching aids to supplement demonstration experiments for students during teaching, and some teachers simply carry out theoretical reasoning and Analysis shows that the harm of short circuit is difficult to establish correctly, and students lack perceptual knowledge of it, which brings certain difficulties to teaching and even affects students' grades and learning interest

[0004] When demonstrating the harm caused by a short circuit, many teachers use the fuse to directly connect the AC 220V circuit to cause a short circuit. This method has the following disadvantages: (1) It is not safe

The AC 220V voltage is not a safe voltage, and electric shock accidents will occur if there is a slight carelessness in the operation process; the molten particles produced when the fuse blows in an instant fall on the desktop and will burn the desktop, and at the same time, it is easy to splash the students in the front row of the operating teacher

(2) Low visibility

When the power supply is turned on, due to the high voltage and high current, the fuse will blow instantly, and the students cannot see clearly whether the current passes through the electrical appliances during the short circuit, and the circuit will be disconnected. The duration of the experimental phenomenon is too short, and the visibility is low. impress students

[0005]In physics teaching, students often feel that short circuit is abstract and difficult to understand. Partial short circuit, judge the connection between the electrical appliances at this time, and then calculate the current, voltage, electric power, etc. The connection between electrical appliances

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