Electric circuits 4 3.1 e the significance of and the relationship between current, voltage and resistance.

Slides:

Advertisements

Similar presentations

See also the NOTES documents posted online at our wikispace, the online self-quizzes posted at our wikispace, and all assignments and materials related.

Advertisements

Ohm’s Law The most important fundamental law in electronics is Ohm’s law, which relates voltage, current, and resistance. Georg Simon Ohm ( ) studied.

Do Now What work is required to move 7 coulombs of charge through a potential difference of 3 volts?

Ohm My Goodness!! Ohm’s Law! Regan Via Chemphys 1-2.

Electrical resistance Resistance measures how difficult it is for current to flow.

Electrical Current Mr. Fleming.

Calculating Electricity

Bellringer A standard household outlet has a voltage of what?

ELECTRICAL COMPONENTS and CIRCUITS Instrumental Analysis II CTEC 1345.

ELECTRIC CURRENT 2 Ohm’s law shows the relationship between current, potential, and voltage. We need a few more rules to make predictions about current.

Circuits. V = IR Voltage is electric potential. It is measured in volts (V). I is current. This is the flow rate of electrical charge. It is measured.

Electrical Resistance Electrical resistance is a measure of how difficult it is for electricity (electrons) to flow through a material. The units of resistance.

2 But what makes the electrons flow? Any electrical circuit requires three things 1.A source 2.A load 3.A means of transmission A definition of a current.

 Measuring current may be accomplished by using a meter called an Ammeter  This meter is placed in the path of the electron flow, and reads the flow.

Ohm’s V=IR. Wheatstone and Ohm Read story Worksheet on Ohm’s Law Using second hand data.

Ohm’s Law Calculating Current, Voltage, and Resistance.

Chapter 8. Ohm’s Law  George Ohm experimented with circuits and came up with a mathematical relationship relating voltage, current and resistance in.

T By iTutor.comiTutor.com.

Today we are going to look at: Current: Measured in “Amperes” or “Amps” (A) “The rate of flow of electrons through a circuit” Voltage: Measured in “Volts”

What we will do today Define the term ‘potential difference’. Look at the ratio V/I for a resistor. Define an equation relating resistance, voltage and.

Series & Parallel Circuits

Electric Circuits containing resistors. Circuits Charges travel in a circuit to maintain charge balance.

Ohm’s Law PSSA Requirement Unit 9 Honors Physics.

Jag Mark Name 4 factors that can affect the resistance of a current?

Ohm’s Law. Georg Simon Ohm born March 16, 1789, Erlangen, Bavaria [Germany]—died July 6, 1854, Munich German physicist who discovered the law, named after.

Electrical Circuits They keep the lights on!!.

Current Electricity.

WARM UP Draw a picture of a SERIES Circuit. Show a battery, a switch, and a light bulb in your drawing. Draw a picture of a PARALLEL Circuit. Show a battery,

ELECTRICAL CIRCUITS.

KS4 Electricity – Resistance, Power and Energy

KS4 Electricity – Resistance

SERIES CIRCUITS Type your answers in the black boxes and check them with the correct answers on the last slide.

How do we measure current and potential difference (voltage) in a circuit? HW:

through a conducting metal

ELECTRICAL RESISTANCE

Current electricity.

Electricity & Magnetism

EDEXCEL IGCSE PHYSICS 2-4 Electrical Resistance

Series Circuit – 1 bulb Series Circuit – 1 bulb.

8.3 Resistance and Ohm’s Law

Integrated Science C Mrs. Brostrom

3 3 Ohm’s Law UEENEEE104A DC PURPOSE:

Electricity & Magnetism

Resistance in Circuits

Why Make Electrons Flow Anyway?

Ohm’s Law The relationship between voltage, current and resistance is known as Ohm’s Law: V = IR Voltage (V) = Current (I) x Resistance (R) Volts.

Electric Current.

Series Circuit.

Comparing Series and Parallel Circuits

Ohm’s Law This formula shows the relationship between current, voltage and resistance. Voltage (Volts) Current (Amps) Resistance (Ohms, )

Electrical Circuits Properties of an electrical circuit include Voltage Volts V Current Amps A Resistance Ohms Ω.

Resistance components & Power

Chapter Twenty: Electric Circuits

Ohm’s Law Page

P2 - Physics Circuits.

Voltage Difference The difference in electrical potential between two places. Unit of measure = V (volts) Voltage causes current to flow through an electric.

Electric Current and Ohm’s Law

SCI 340 L43 circuits Group Work

Electric Resistance describes how an electrical conductor (wire) opposes the flow of a current (flow of electrons) to overcome this opposition a voltage.

ELECTRICAL CIRCUITS All you need to be an inventor is a good imagination and a pile of junk. -Thomas Edison.

Presentation transcript:

Electric circuits 4 3.1 e the significance of and the relationship between current, voltage and resistance.

What is resistance? Current particles electrons Resistance opposition harder Flow friction collision temperature low High ammeter reading

Current and voltage If you get a straight line it means that the two quantities current and voltage are proportional. x x Current, I / amps x x x x x x Potential difference / V If you double the voltage then the current doubles. Ohm’s Law: The current flowing through a wire is proportional to the potential difference (voltage) across it provided the temperature remains constant. Georg Ohm 1826

V=IR We can express Ohm’s Law mathematically using the equation: Voltage = Current x Resistance V=IR Voltage measured in Volts (V) Current measured in Amps (A) Resistance measured in Ohms ()

V=IR We can express Ohm’s Law mathematically using the equation: Voltage = Current x Resistance V=IR Voltage measured in Volts (V) Current measured in Amps (A) Resistance measured in Ohms ()

Resistance for a bulb If you have a filament bulb and it has a current of 20A running through it, with a potential difference of 100V across it, what is the resistance of the bulb? V = IR R = V/I R = 100V/20A R = 5 

Resistors in series Total resistance = R1 + R2 4 2 What is the total resistance for the circuit shown? Total resistance = R1 + R2 Total resistance = 4  + 2  Total resistance = 6 

Resistors in series Total resistance = R1 + R2 4 2 What is the total resistance for the circuit shown? Total resistance = R1 + R2 Total resistance = 4  + 2  Total resistance = 6 

Simple practice Voltage (V) Current (I) Resistance (Ώ) Formulae 3.0A 4Ώ 6V 12 Ώ 12V 2A 6v 4A 12v 3Ώ

Simple practice Voltage (V) Current (I) Resistance (Ώ) Formulae 12.0 4Ώ V= I R 6V 0.5 12 Ω I = V/R 12V 2A 6 Ω R = V/I 6v 4A 1.5 Ω 12v 3Ώ

Complete worksheet series circuits.

Plenary – Quick Quiz Name these components What are the units of Voltage Current Resistance Why is better to have gold coated tips on your headphone wires? (key words current and resistance)