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

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

Connect a series circuit:

Note: The switch must be ____ when wiring to avoid short circuit.

Question: The light bulb glows, which proves that _____ has passed.

What is the direction of the current?

Ask a question:

What is the relationship between the currents everywhere in a series circuit?

I think……??

The current IA flowing through point A, the current IB flowing through point B, and the current IC flowing through point C, what is the relationship between them?

Note when using an ammeter:

1. The ammeter must be connected to the circuit under test _____

2. Current flows in from the _____ terminal of the ammeter and flows out from the _____ terminal of the ammeter.

3.Be careful to choose appropriate ___ and ______ before use

4. Use the ______ method to select the measuring range

Analysis and argumentation:

What do your measurements indicate?

ＩＡ_____ＩB_____ＩIC

The current in a series circuit is equal everywhere

That is: I1=I2=I

exercise

1. There are two light bulbs L1 and L2 connected in series in the circuit. After closing the switch, it is found that L1 is very bright and L2 is very dark, then ( )

A. The current in L1 is larger

B. The current in L2 is larger

The currents in C, L1 and L2 are the same

D. Since the brightness of the lamps is different, the magnitude of the current cannot be compared.

2. There are two electrical appliances in a circuit, which use current

When measuring with a meter, if it is found that the current passing through each electrical appliance is different, then the connection between the two electrical appliances must be _____;

If the current through each consumer is found to be the same, the connection between the two consumers is _______________.

Summary: 1. Current characteristics of series circuits

Characteristics of series circuits:

① There is only one current path; ② The switch controls the entire circuit; ③ Electrical appliances influence each other.

The current is equal everywhere in a series circuit.

Expression: I1=I2=I3＝……

Summary: 2. Characteristics of parallel circuits

Characteristics of parallel circuits: There are more than two paths for current, and the current splits and merges; the electrical appliances used in each branch work independently and do not affect each other; the trunk switch controls the entire circuit, and the branch switch controls the branch where it is located.

The current in the trunk of a parallel circuit is equal to the sum of the currents in each branch.

Expression: I=I1+I2

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"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)..

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Update Time: 2024-10-03

This template belongs to Physics courseware Lu Jiao Edition Ninth Grade Physics Volume 1 industry PPT template

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