"Current Laws of Series and Parallel Circuits" Current and Circuit PPT Courseware 3

Description

"Current Laws of Series and Parallel Circuits" Current and Circuit PPT Courseware 3

Do you remember the experiment you did in the last class?

The ammeter is connected at different locations in this simple circuit. What is the relationship between the two ammeter readings?

When electrical appliances are connected in series or parallel, what is the relationship between the current flowing through each electrical appliance?

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 interfere with each other.

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:

1. Design experimental circuit;

2. Connect the circuit according to the circuit diagram;

3. Make measurements and record the measurement data in tables;

4. Replace two other small light bulbs with different specifications and experiment again.

When connecting the circuit please pay attention to:

1. When wiring, please note that the switch must be in a disconnected state; there should be no short circuit;

2. The ammeter must be connected in series with the circuit under test;

3. The ammeter must be wired correctly: reverse connection is not allowed;

4. The range of the ammeter must be selected accurately; a test touch must be performed;

5. Be aware of the range and graduation value when reading;

2. Characteristics of parallel circuits

Characteristics of parallel circuits:

1. The current has more than two paths, and the current divides and combines;

2. The electrical appliances used in each branch work independently and do not affect each other;

3. The trunk switch controls the entire circuit, and the branch switch controls the branch where it is located.

practice

1. As shown in the figure, Xiaoyang used an ammeter to explore the current relationship in the series circuit. He used an ammeter to measure the currents at A, B, and C in the circuit. He found that IA = 0.2 A, then IB = _______, IC = _______.

2. 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.

3. 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 _______________________.

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Update Time: 2024-07-04

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

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