V

IVI

= Constant

LESSON PLAN

Level of Education : Junior High SchoolSubject : ScienceClass/Semester : IX/1Topic : ElectrodynamicsSub Topic : Ohm LawAllocation of Time : 2 X 40 minutes

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

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

C. Learning MaterialRelation between electric current and potential difference in the circuit.

Ohm LawDeveloped 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:

Formula :

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

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

I=VR

Meeting

Phase Rincian Kegiatan

time

(minute)

First Explores

Engagement

Predicts

Introduction

Find the information about 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 )

5

Elaboration

Exploration

observes

Main Activity

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

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

10

Explanation

Confirmation

Explanation

Elaboration

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.

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

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

Meeting

Phase Rincian Kegiatan

time

(minute)

Evaluation Closing

Give the test.

5

G. Learning Resource : 1. Student's Book, Chapter 14 Electrodynamics2. Student's Worksheet: The Application of Ohm's Law3. Material and tools::

a. 4 battery c. Switchd. Wiree. Volt meterf. Ammeterg. Bulb

H. Assessment :

Indicatorassessment

Tecnic Instrument Instrument Observe the relation

between electric current and potential difference in a circuit.

performence

written test

Unjuk Kerja

essay

Experiment to find relation between electric current and

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

No Activity Score explanation4 3 2 1

1 Design the material2 Calibration 3 Avoid the paralaks

4 Calculate the result5 Processing data

Score

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

No Name Discipline activity Group work Rectitude attitude Score

Score = 1 to 51 = bad2 = not enough3 = enough4 = good5 = 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)