"Scientific Exploration: Current in Series and Parallel Circuits" Understanding Circuits PPT Courseware 5

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"Scientific Exploration: Current in Series and Parallel Circuits" Understanding Circuits PPT Courseware 5

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?

Experimental exploration

Study 1: Current laws of series circuits

Guess: What might be the relationship between the currents flowing through points A, B, and C?

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.

Experiment 2: Current law of parallel circuits

Guess: What might be the relationship between the currents flowing through points A, B, and C?

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.

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 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.

3. There are two electrical appliances in a circuit. When measuring with an ammeter, 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, then the connection between the two consumers is _______________.

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Update Time: 2024-09-08

This template belongs to Physics courseware Shanghai Science Edition Ninth Grade Physics industry PPT template

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