Can you kill yourself with a 9 volt battery?. Resistivity Current Density of a conductors depends on...

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•Can you kill yourself with a 9 volt battery?

Transcript of Can you kill yourself with a 9 volt battery?. Resistivity Current Density of a conductors depends on...

Page 1: Can you kill yourself with a 9 volt battery?. Resistivity Current Density of a conductors depends on Electric Field and the properties of the material.

• Can you kill yourself with a 9 volt battery?

Page 2: Can you kill yourself with a 9 volt battery?. Resistivity Current Density of a conductors depends on Electric Field and the properties of the material.

Resistivity

J =E

ρ

ρ =E

J

ρ =V m

A m2 =V ⋅mA

=V

A⋅m =Ω⋅m

•Current Density of a conductors depends on Electric Field and the properties of the material

•Those properties are symbolized with the Greek letter rho and referred to as resistivity

•The unit for resistivity is Ohm-meters

•Resistivity changes with temperature

Page 3: Can you kill yourself with a 9 volt battery?. Resistivity Current Density of a conductors depends on Electric Field and the properties of the material.

Zero-Resistivity Superconductors

Superconductors are used to make medical scanners, magnetometers, and rail guns

Page 4: Can you kill yourself with a 9 volt battery?. Resistivity Current Density of a conductors depends on Electric Field and the properties of the material.

Resistivity & Resistance

R =ρL

A•Unit for Resistance is Ohms (Ω)

•Resistance is higher for wires of longer length

•Resistance decreases with larger cross-sectional areas

Page 5: Can you kill yourself with a 9 volt battery?. Resistivity Current Density of a conductors depends on Electric Field and the properties of the material.

Conductance

• The reciprocal of Resistance

• Lord Kelvin called the unit the mho

• Officially the Siemens

• 1 mho = 1 Siemens

Page 6: Can you kill yourself with a 9 volt battery?. Resistivity Current Density of a conductors depends on Electric Field and the properties of the material.

Ohm’s Law

E = ρJ

V

L=I

V = IρL

AV = IR

Page 7: Can you kill yourself with a 9 volt battery?. Resistivity Current Density of a conductors depends on Electric Field and the properties of the material.

Units

V = IR

Volts = Amps⋅Ohms

Ohms =Volts

Amps

Page 8: Can you kill yourself with a 9 volt battery?. Resistivity Current Density of a conductors depends on Electric Field and the properties of the material.
Page 9: Can you kill yourself with a 9 volt battery?. Resistivity Current Density of a conductors depends on Electric Field and the properties of the material.

I-V Graph for Ohmic Material

Page 10: Can you kill yourself with a 9 volt battery?. Resistivity Current Density of a conductors depends on Electric Field and the properties of the material.

Diode: Ohmic or Not Ohmic?

Page 11: Can you kill yourself with a 9 volt battery?. Resistivity Current Density of a conductors depends on Electric Field and the properties of the material.
Page 12: Can you kill yourself with a 9 volt battery?. Resistivity Current Density of a conductors depends on Electric Field and the properties of the material.

Guess the Resistors!