OHM'S LAW

Ampere

named after Andre Marie Ampere

Andre Marie Ampere

Isaac newton of electricity

Conventional current

from positive to negative terminal

Direct Current

one way

Alternating Current

charging every 16 seconds

Current Density (J)

proportional to electric negativity

Resistance (R)

emepedes the flow of current

Ohm

unim of resitance

named after George Simon Ohm

Electric conductivity

relative to current density and field

Resistor

restrict the flow of current

Potentiometer

3 terminal Variable resistor

Black

0

Brown

1

Red

2

Orange

3

Yellow

4

Green

5

Blue

6

Violet

7

Gray

8

White

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Factors affecting Resistance of wore

Cross sectional Area (A)

length

Cross sectional Area

Greater the CSA, the lesser the resistance

Longer

longer the wire the higher the resistance

Vesistivity

material of wire

Conductor

small resistance

insulator

big resistance

insulator

decrease temperature

conductor

increase temperature

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