"Current Laws of Series and Parallel Circuits" Current and Circuit PPT Courseware 2

Description

"Current Laws of Series and Parallel Circuits" Current and Circuit PPT Courseware 2

1. Current characteristics of series circuits

Conclusion: The current is equal everywhere in a series circuit.

Expression: I1=I2=I3

2. Current characteristics of parallel circuits

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

Expression: I =I1+I2

Assessment and communication:

Knowledge application:

A classmate has a TV, a washing machine, and two lighting lamps at home. Their working currents are 200mA, 1 A, 300mA, and 250mA respectively. If the current in the main circuit is not allowed to exceed 3A, can these electrical appliances be used at the same time?

Apply what you learn

1. There are 20 small bulbs connected in series on the birthday lantern. If the current at the power plug is 100 mA, then the current flowing through each small bulb is ______A.

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. As shown in the figure, when measuring the current with an ammeter, it is found that the pointers of the two ammeters are at the same position, then the indication of ammeter A1 is ______, the indication of A2 is ______, and the current in lamp L1 is ______.

4. 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, then the connection between the two consumers is __________________.

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Update Time: 2024-06-27

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

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