Lesson Plan Ohm Law

LESSON PLAN

Level of Education

: Junior High School

Subject

: Science

Class/Semester

: IX/1

Topic

: Electrodynamics

Sub Topic

: Ohm Law

Allocation of Time

: 2 X 40 minutes

A. BASIC COMPETENCE Students are able to analyze the experiment of electrodynamics in a circuit.

B. INDICATOR Students are able to: 1. Observe the relationship between electric current and potential difference in a circuit.

C. Learning Material Relation between electric current and potential difference in the circuit. Ohm Law Developed in 1827 by George Simon Ohm :

 the greater the voltage, the more the current.  The more the resistance for the same voltage, the less the current.  Current is proportional to the applied voltage and inversely proportional to the resistance. Ohms Law states:  The amount of current (I) that will flow is proportional to the voltage applied (V), and inversely proportional to the resistance (R) of the circuit.  As Resistance increases, current decreases.

Relation between electric current and potential difference in a circuit is drawn in the graph below:

V I V I= Constant

I=

Formula :

Where:

V R

I = current (amperes, A) V = voltage (volts, V) R = resistance (ohms, Ω)

D. MCC: 75

E. Learning Method and Model:

1. Model

: Learning Cycle

2. Strategy

:

POE (Predict, Observe, Explanation)

3. approach

: CTL

4. Method

: Experiment, Discuss, DI

F. Teaching Learning Process

Meeting

First

time Phase

Rincian Kegiatan

Explores

Introduction

Engagement



Find the information about

(minute ) 5

Meeting

time Phase

Predicts

Rincian Kegiatan

(minute )

specific characteristic of flashlight through question and answer that related with the topic

 Give the problem : Do you know flashlight? Why the lamp will bright if there is using more battery in the flashlight?

 Give the information about this topic.

 Make a group (learning community ) Elaboration

Main Activity

Exploration

In the group, student do the experiment and make the result through the worksheet

observes

Student design the material using the figure below:

Student writes the result measuring of ammeter and voltmeter with different number of battery in the table.

Student draws the graph of Relation between electric current (I) and potential (V) through the observation data Explanation

Confirmation

Student presents Relation between electric current and potential according to the data and graph. Due the discussed, teacher guide the student to get Ohm Law Concept.

10

time

Meeting

Phase Explanation

Rincian Kegiatan Teacher give the question about application Ohm Law in daily life.

Elaboration

“What will happen if the flashlight is changed with the other specs?”

Evaluation

Closing

 Give the test.

G. Learning Resource

:

1. Student's Book, Chapter 14 Electrodynamics 2. Student's Worksheet: The Application of Ohm's Law 3. Material and tools:: a. c. d. e. f. g.

4 battery Switch Wire Volt meter Ammeter Bulb

H. Assessment

:

(minute )

5

assessment

Indicator Tecnic

Instrument

Observe the relation performenc between e electric current and potential difference in a circuit.

Instrument

Unjuk Kerja Experiment to find relation between electric current and

essay written test

1. How the relation between electric current and potential in the circuit if the resistance is constant? 2. How much voltage is being supplied to a circuit that contains a 1 Ohm resistance, if the current that flows is 1.5 Amperes? 3. 2A electric current flows through the wire. On the edges of the wire is provided with 12 Voltage. Determine the resistance on the electricity wires are

Rubric and criteria assessment

N o 1 2 3 4 5

Activity 4 Design the material Calibration Avoid the paralaks Calculate the result Processing data Score

Score 3 2

explanation 1

Mark = (sore/20)x 100

Assessment Instrument: 1. How the relation between electric current and potential in the circuit if the resistance is constant? 2. How much voltage is being supplied to a circuit that contains a 1 Ohm resistance, if the current that flows is 1.5 Amperes? 3. 2A electric current flows through the wire. On the edges of the wire is provided with 12 Voltage. Determine the resistance on the electricity wires are

Attitude Rubric

N o

Name

Discipli

activit

Group

Rectitu

attitud

ne

y

work

de

e

Score

Score = 1 to 5

1 2 3 4 5

= bad = not enough = enough = good = Very goodPenafsiran angka: 1= sangat kurang, 2= kurang,

Created by:

Heru Soejanto SPd (SMP 1 Pamulang) Aries Triwidajati S. Spd (SMP 2 Cileunyi) Sumarni puspita sari,Spd (SMP 3 Luwuk)