Ohm Law

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

 

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

Observe the relationship between electric current and potential difference in a circuit through the observation the data

Cause Effect = Opposition Every conversion of energy from one form to another can be related to this equation.

Simple analogy: Water in a pipe

The flow of water through pipes is caused by pressure differences, and the flow is measured by volume of water per time. Water flows from high pressure to low pressure

The concept of voltage will be like pressure. Electricity flows from high voltage to low voltage An electric current is a flow of microscopic particles called electrons flowing through wires and components. +

-

In which direction does the current flow? from the positive terminal to the negative terminal of a cell.

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.

V I= R Where: A)

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

RELATION BETWEEN POTENTIAL DIFFERENCE AND ELECTRICS CURRENT Objective : searching relation between current one particular network

Apparatus and material 2.4 battery 3.Switch 4.Wire 5.Volt meter 6.Ammeter 7.Bulb

strength and potential difference at

:

No

Baterry

1 2 3 4 5 6

1 2 3 4 5 6

I  V  (Ampere) (Volt) 1 5 2 10 3 15 4 20 5 25 6 30

Insert Fig 4.8

2A electric current flows through the wire. On the edges of the wire is provided with 12 Volt. Determine the resistance on the electricity wires are

known: I=2A

answer: V=I.R

V = 12 V

12 = 2 . R

asked:

R=6Ω

R=…

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.

V I= R Where: A) (ohms, Ω)

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

1. How much voltage is being supplied to a circuit that contains a 1 Ohm resistance, if the current that flows is 1.5 Amperes? 2. 4 A flow of electricity flowing through a 10 ohm resistor. How-voltage electricity that is read by the voltmeter is connected to the tip-end of the resistor? 3. If a 12 Volt car battery is powering headlights that draw 2.0 Ampere of current, what is the effective resistance in the circuit?