"Current and Circuit" PPT Courseware 3

Description

"Current and Circuit" PPT Courseware 3

Discussion: What equipment is needed to make a small light bulb light up, a small fan rotate, and a small electric bell sound?

Think about it, do it

Equipment: a small light bulb, a small motor, a musical doorbell, a switch, two batteries (with battery box) and some wires.

Requirements: Connect the circuit three times to make the light bulb light up, the motor rotate, and the doorbell sound. Light bulbs, motors, and doorbells are controlled by switches.

1. Current

1. Directional movement of charge

Directional movement may be positive charge, negative charge, positive and negative charges simultaneously.

2. Current direction:

The direction in which positive charges move

External power supply: positive pole of power supply and negative pole of electrical appliances

Inside the power supply: negative pole and positive pole of the power supply

3. Conditions for generating continuous current:

(1) There must be a power supply.

(2) The circuit must be closed.

2. Circuit composition:

1. What are the conditions for forming a complete circuit?

Power supply, electrical appliances, wires, switches

1. Composition: four parts: power supply, switch, electrical appliances and wires

2. Component functions:

Power supply: Provides electrical energy.

Electrical appliances: consume electricity

Switch: (electric key) controls the circuit on and off

Wires: connect power supply, electrical appliances and switches

1. Which of the following statements about current is correct ()

A. The movement of charges creates an electric current

B． The directional movement of charges creates an electric current

C. Only the directional movement of positive charges can form an electric current

D. Only the directional movement of free electrons can form an electric current

2. Which of the following statements is correct ( )

A. Electric current is the movement of charged particles B. If there is current in the circuit, there must be power

C. If there is power in the circuit, there must be current D. A power supply is a device that consumes electrical energy

Note when drawing a circuit diagram:

① Symbols must be uniformly specified;

②The drawn symbols correspond one-to-one with the actual objects;

③Arrange it reasonably and distribute it evenly. Component symbols must not be drawn at the corners of the circuit diagram;

④The circuit diagram is rectangular, and the wires should be horizontal and vertical.

Requirements for drawing a circuit diagram:

(1) Use unified symbols to express.

(2) When connecting, draw the lines horizontally and vertically.

(3) Components cannot be drawn at corners (except varistor)

(4) The lines should be drawn concisely, neatly, beautifully and with reasonable layout.

Summary: Three states of the circuit diagram:

1. Path: a circuit with a switch closed and connected everywhere

2. Open circuit: also called open circuit, a switch is disconnected, or a circuit is disconnected somewhere.

3. Short circuit: A circuit that is directly connected to the two poles of the power supply without passing through electrical appliances. A short circuit will damage the power supply and wires. Divided into two types.

summary:

Things you should pay attention to when connecting the circuit correctly:

①No short circuit

②The switch should be turned off when connecting the circuit

③ Check that the connection is correct before closing the switch.

Keywords: Current and Circuit teaching courseware, New People's Education Edition ninth-grade physics PPT courseware, Ninth-grade physics slide courseware download, Current and Circuit PPT courseware download, .ppt format

For more information about the "Current and Circuit" PPT courseware, please click on the "Current and Circuit ppt" tab.

"Exploring the Laws of Current in Series and Parallel Circuits" Current and Circuit PPT Courseware 2:

"Exploring the Laws of Current in Series and Parallel Circuits" Current and Circuit PPT Courseware 2 Experience: Current Characteristics of Series and Parallel Circuits Experiment Preparation: Power supply, switch, wires, and two small light bulbs with different specifications. Activity 1: Connect two small light bulbs to form a series circuit (as shown in the picture)..

"Exploring the Laws of Current in Series and Parallel Circuits" Current and Circuit PPT Courseware:

"Exploring the Laws of Current in Series and Parallel Circuits" Current and Circuit PPT Courseware Connecting series circuits: Note: The switch must ____ when wiring to avoid short circuit. Question: The light bulb glows, which proves that _____ has passed. What is the direction of the current? Ask questions..

"Measurement of Current" Current and Circuit PPT Courseware 9:

"Measurement of Current" Current and Circuit PPT Courseware 9 Current 1. Current intensity: Indicates the size of the current. Current intensity is referred to as the current symbol I 2. The basic unit of current: ampere, referred to as ampere, symbol A. Common units: milliamps (mA) and Microampere (A) conversion relationship: 1A=..

File Info

Update Time: 2024-08-07

This template belongs to Physics courseware People's Education Edition Ninth Grade Physics Complete Book industry PPT template

Preview