"Application of Ohm's Law" Ohm's Law PPT Courseware 4

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"Application of Ohm's Law" Ohm's Law PPT Courseware 4

Self-study outline: (Students please take the time to read the series and parallel connection of resistors on pages 26 to 27 of the textbook. After three minutes, answer the following questions)

(1) Content:

The current in a conductor is directly proportional to _____ at both ends of the conductor and _____ to the resistance of the conductor. This law was summarized by German physicists _____ and _____ through experiments, so it is called _____.

(2) Formula: I=U/R

(3) What do the quantities in the formula represent:

I——The current flowing through this conductor——Amperes (A)

U - the voltage across this conductor - volts (V)

R - resistance of this conductor - ohms (Ω)

(4) Deformation formula U=I R ​​R= U/I

(5) What should we pay attention to when using the formula?

(6) How many volts is the voltage in a household circuit?

(7) What calculations can be performed using Ohm's law or deformation formula?

application:

1. Given the voltage and resistance, find the current

2. Given the resistance and current, find the voltage

3. Given the current and voltage, find the resistance

(8) Through self-study and comparing the previous solving process of calculation problems, what do you think are the general calculation steps for solving electrical calculation problems?

Example 1: The resistance of the large resistor in the test pen is 880 kΩ. The resistance of the neon tube and the human body is much smaller than this value and can be ignored. What is the current flowing through the human body during use?

Problem solving steps:

(1) Draw a simple circuit diagram

(2) Mark the known quantities and required quantities

(3) Solve I

Known: U=220V R=880KΩ=880000Ω

Find: I =?

Solution: I =U/R=220V/880×10³Ω=0.25×10-³A

Answer: The current flowing through the human body is 0.25×10-3 A

Looking back at your goals, what did you gain?

learning target:

1. Understand the content of Ohm's law and be able to use the proportional formula.

2. Master the Ohm’s Law formula and the meaning and unit represented by each letter in the formula.

3. Be able to perform simple calculations based on Ohm's law formula and deformation formula.

Ohm's Law: The current in a conductor is directly proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor.

Formula: I=U/R

Deformation formula: U=IR R=U/I

The units in the Ohm's law formula are unified, the same conductor, the same circuit, the same moment, two conditions, and one property.

To put it simply, the two systems are one, two conditions, and one nature.

1. When using Ohm's law, the units of each physical quantity must be unified. The unit of current is ampere, the unit of voltage is volt, and the unit of resistance is ohm.

2. The current, voltage, and resistance in the formula are all relative to the same section of conductor or the same section of circuit, and are at the same time.

3. The current stated in the law is proportional to the voltage, which is true when the resistance is constant. The current is inversely proportional to the resistance of the conductor when the voltage is constant, that is, the two relationships have different prerequisites.

4. Resistance is a property of a conductor. It has nothing to do with the presence or absence of voltage, the magnitude of voltage and the magnitude of current. It is numerically equal to voltage divided by current. Therefore, we cannot think that resistance R is proportional to voltage U. , inversely proportional to the current I.

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Update Time: 2024-07-30

This template belongs to Physics courseware Beijing Normal University Ninth Grade Physics Volume 1 industry PPT template

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