"Current Laws of Series and Parallel Circuits" Current and Circuit PPT Courseware

Description

"Current Laws of Series and Parallel Circuits" Current and Circuit PPT Courseware

1. Current

Current is a physical quantity that represents the strength of an electric current, usually represented by the letter I. Its unit is ampere, or ampere for short, and its symbol is A.

The current in some devices is very small, so usually we also have the following smaller units: milliamps and microamps

1A=103mA 1A=106μA

The definition of current is I=Q/t

Q represents charge (coulomb), t represents time (seconds)

I meter current (A)

Ammeter connection rules

Rule 1: The ammeter must be connected in series with the electrical appliance being measured

Rule 2: The measured current should not exceed the range of the ammeter (test touch method)

Rule 3: The connection method of the terminals must be correct (+ in, - out, maximum measurement value)

Rule 4: Do not connect directly to the power supply.

Reasons for different situations:

When a classmate used an ammeter to measure current, he found that the pointer of the ammeter quickly swung to the maximum scale as soon as he made a "test touch". The reason for this may be ().

A. The positive and negative terminals of the ammeter are connected reversely

B． The filament of the small light bulb is broken

C. There is a short circuit somewhere in the line

D. Insufficient conditions to judge

Experiment 1: Explore the current laws of series circuits

1. Ask questions:

What is the relationship between the currents at various points in a series circuit?

2. Conjecture or hypothesis:

3. Design experiments:

(1) Experimental equipment: dry batteries, switches, two light bulbs, ammeter, and several wires

(2) Experimental circuit diagram:

(3) Experimental steps:

Experiment 2: Explore the current laws of parallel circuits

1. Ask the question: What is the relationship between the currents at various points in the parallel circuit?

2. Conjecture or hypothesis:

3. Design experiments:

(1) Experimental equipment: dry batteries, switches, two light bulbs, ammeter, and several wires

(2) Experimental circuit diagram:

(3) Experimental steps:

Current laws of parallel circuits

In a parallel circuit, the current in the main circuit is equal to the sum of the currents in the parallel branches.

1. As shown in the figure, in the series circuit, connect the ammeter at a, b, and c respectively, close the switch, and the measured currents are Ia, Ib, and Ic respectively. The relationship between these three currents is Ia__Ib__Ic

2. As shown in the figure, in the parallel circuit, connect the ammeter at a, b, and c respectively, close the switch, and the measured currents are Ia, Ib, and Ic respectively. The relationship between these three currents is Ia__Ib__Ic

3. There are two lights L1 and L2 connected in series in a circuit. After closing the switch, it is found that L1 is very bright and L2 is dark, then...

A. The current in L1 is larger

B． The current in L2 is larger

C. The currents in L1 and L2 are equal

D. Since the lights are different in brightness, the current cannot be compared.

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Update Time: 2024-11-24

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

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