"Composition and Connection Methods of Circuits" explores simple circuit PPT courseware

Description

"Composition and Connection Methods of Circuits" explores simple circuit PPT courseware

learning target

1. Know the composition of a circuit, know paths, open circuits and short circuits, be able to connect simple circuits, and draw circuit diagrams.

2. Know the two connection methods of circuits, be able to connect simple series and parallel circuits, and be able to draw and identify series and parallel circuit diagrams.

Core test points: short circuit and open circuit of circuits, series and parallel analysis of circuits

Preview before class

1. Among the following common items, the ones that are not electrical appliances are ()

A． TV set b. Microwave oven C. Pull switch D. Audio

2. In daily life, people often say "turn on the lights" and "turn off the lights", and their physical meaning is ( )

A． Turning on the light means turning off the switch, turning off the light means turning on the switch

B． Turning the light on and off means closing the switch

C. Turning on the light means closing the switch, turning off the light means turning off the switch

D. Turning the lights on and off refers to turning off the switch

3. When using a power supply, it is absolutely not allowed to use wires to directly connect the positive and negative poles of the power supply. This is because ( )

A． Too much current will damage the power supply

B． The current is too large and may damage electrical appliances

C. The current is too small and the electrical appliance cannot work properly.

D. The current is too small and the power supply cannot provide continuous current normally.

Lectures in class

Knowledge point 1. Composition of circuit

A complete circuit should include four circuit components such as power supply, electrical appliances, switches and wires, all of which are indispensable.

(1) Power supply: A power supply is a power supply device that can provide electrical energy. When the power supply works, it converts other forms of energy into electrical energy. In addition to dry batteries, common power sources include batteries and generators.

(2) Electrical appliances: Electrical appliances are devices that use electrical energy to work. When working, electrical appliances convert electrical energy into other forms of energy. In addition to light bulbs, common electrical appliances include electric stoves, televisions, electric bells, refrigerators, etc.

(3) Switch: A switch is a device that controls the opening and closing of a circuit. In addition to blade switches, common switches also include pull switches, toggle switches, etc.

(4) Wires: Wires connect power supplies, electrical appliances, and switches to form a path for electric charges to move. Common wires are metal wires, and the outer casing of the wire is covered with a layer of plastic, rubber and other insulating materials.

[Typical Example 1] (2014·Xinhua County) As shown in the picture, the magnetic monkey is the stingiest monkey in history. As long as you take away the banana from its hand, it will keep making a fuss. Give him the banana and he will stop making noise. The role of banana is equivalent to ( ) in the circuit

A． switch

B． wire

C. power supply

D. sound generator

【Exercise 1】In the flashlight with metal shell, the dry battery is the ______ of the flashlight, the small bulb is the ______ in the circuit, the button is the ______ in the circuit, and the casing is the ______ in the circuit.

In-class testing

1. (2014·Benxi) As shown in the picture, the sweet and sour juicy fruits light up a row of light-emitting diodes. In this simple circuit, the fruits are equivalent to _____. If you want to control the on and off of this circuit, you should also Install _____ in the circuit.

2. In the circuit as shown in the figure, when the switch S is closed, the lights L1 and L2 do not light up. A classmate uses a wire to check the circuit fault. He first connects the wire in parallel to both ends of the light L1 and finds that L2 is on and L1 is not on. is on, and then connect the wires in parallel to both ends of L2, and find that neither light is on, from which we can judge ( )

A． Lamp L1 is open circuit B． Lamp L1 short circuit

C. Lamp L2 short circuit D. Lamp L2 is open circuit

3. (2014·Jieyang) The circuit diagram in the picture corresponds to the actual diagram ( )

4. For festival lanterns, if one bulb breaks and the other bulbs cannot work normally, then these lanterns ()

A． It must be a series connection B. Must be connected in parallel

C. It may be in series or in parallel D. Unable to determine

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"The Composition and Connection Method of Circuits" explores simple circuit PPT courseware 3:

"Composition and Connection Methods of Circuits" Exploring Simple Circuit PPT Courseware 3 (a) Power transmission circuit (b) Printed circuit (c) Household circuit Activity 1 How to make a small light bulb glow? Circuit A circuit is composed of ______, ______, ______, ______. Power supply: able to sustain...

"The Composition and Connection Method of Circuits" explores simple circuit PPT courseware 2:

"The Composition and Connection Method of Circuits" Exploring Simple Circuit PPT Courseware 2 Teaching Objectives 1. Know the composition of circuits, know paths, open circuits, and short circuits. 2. Be able to connect simple circuits and draw corresponding circuit diagrams. 3. Know that there are two ways to connect a circuit and be able to connect strings...

File Info

Update Time: 2024-07-06

This template belongs to Physics courseware Guangdong and Shanghai Edition Ninth Grade Physics Volume 1 industry PPT template

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