"Short-circuit" phenomenon in household small appliances and analysis of test questions

+ Fan = (2001 Beijing) is a schematic circuit diagram of an electric blanket. i* is the resistance in the electric blanket, i is the resistance in series with the electric resistance blanket resistance wire, the electric blanket is marked with *220V100W*, and S is the switch that controls the electric blanket to be in the heating state or the heat preservation state.

Using the learned formula to reason, when the switch S is disconnected, the electric blanket is in the heating state or the heat preservation state. If the current is required to convert 60J electric energy into internal energy per minute through the resistance wire during the heat preservation, how much the resistance of the resistor R is? Analysis of this problem and the circuit diagram of Example 1 belong to one type, and there are switches "The short circuit analysis is the same as in Example 1.

That is, when S is disconnected, the electric blanket is in a warm state.

When S is disconnected in the holding state, p/when S is closed in the heating state, P.=100W, so according to the characteristics of the series circuit and because 樘==9 cases 3, for example, S is a switch made of temperature sensing material, ruler, It is a resistor, and J2 is a resistance wire for heating. (1) Try to judge which state the rice cooker is in when the switch S is turned on and off, and (2) how many solutions of the enamel when the power in the heat-insulated state is 12 (1) Since the voltage applied to both ends of the rice cooker does not change, when s is disconnected, the resistance and resistance/2 are connected in series, and the total resistance is j=A+j2, and the power consumption of the rice cooker is small according to p=| So it is kept warm. When s is closed, the resistance 圮 is shorted, and the total resistance is i2, so the rice cooker consumes a large amount of power and is in a heated state.

(2) Power of K2 in the state of heat preservation: Power in the state of heating: p'2 is known by the meaning of p2=|Guang 2, so the two sides are multiplied by § (...the corpse is about the short-circuit) There are not many occurrences. Students often have difficulty in circuit analysis and feel that they have no way to start. Therefore, we should pay more attention to daily life and pay attention to the cultivation of comprehensive analytical ability, so that students can actively explore knowledge and explore science. good habits.

(:2002-Suspended shear R balance questioning solution Hebei Huangpi County Zhongjie Farm Teaching and Research Section (061108) Zhang Bojun Hebei Zhongjie Farm Total Field Middle School (061108) Ding Shuming junior high school physics exercises have a type of leverage problem, is the lever suspension Up, I call it a hanging lever. The fulcrum of the hanging lever is generally the joint point between the rope and the object. Solving such problems should obviously be based on the principle of leverage balance. Since the balance of the lever is not the balance of force but the product of the force and the arm (hereinafter referred to as torque) is the moment balance, so the correct choice of torque to establish the balance equation becomes the key to solving the problem.

1. Partial Torque and Partial Torque Balance Example 1 The long straight iron bar AC with uniform thickness is folded into two perpendicular segments at point B, and the end point A is suspended by a wire. When stationary, the AB segment is exactly 4 with the vertical direction. Angle, as shown, the ratio of the length of the iron bar AB to the length of the BC segment is explained by the title. The iron bar folded at right angles can be regarded as a lever, A is a fulcrum, and a straight line is drawn vertically along A. In D, when the iron rod is stationary, the moment generated by the gravity of the CD segment is equal to the moment generated by the gravity of the AB segment and the BD segment (the two are equal), ie

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