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Authoritative PPT Summary
"Exploring Current in Series and Parallel Circuits" Exploring Simple Circuits PPT Courseware 2
teaching objectives:
1. Be able to use an ammeter to measure series and parallel currents and train basic skills in connecting circuits.
2. Understand the current characteristics of series and parallel circuits.
3. Be able to measure data, analyze and summarize, and draw conclusions.
4. Develop good habits and be realistic.
Review questions
1. Current direction regulations and unit conversion.
2. Details of the use of ammeter.
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?
What is the relationship between the currents everywhere in a series circuit?
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?
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
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, it is impossible to compare the magnitude of the current.
2. There are two electrical appliances in a circuit. When measuring with an ammeter, if the current passing through each electrical appliance is found to be 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 ____________.
Assignments and Tutorials
1. Homework, after class 2.3
2. Preview what voltage and unit are? Know what common voltages are.
3. Read the voltmeter instruction manual.
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"Exploring Current in Series and Parallel Circuits" Explore simple circuits PPT courseware:
"Exploring Current in Series and Parallel Circuits" Exploring Simple Circuit PPT Courseware Learning Objectives 1. Ability to use ammeters to measure current in series and parallel circuits. 2. Know the current characteristics of series and parallel circuits. 3. Understand the basic methods of quantitatively studying physical problems and measuring numbers..