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.

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Presentation transcript:

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 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

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

Resistivity & Resistance Unit for Resistance is Ohms (Ω) Resistance is higher for wires of longer length Resistance decreases with larger cross- sectional areas

Conductance The reciprocal of Resistance Lord Kelvin called the unit the mho Officially the Siemens 1 mho = 1 Siemens

Ohm’s Law

Units

I-V Graph for Ohmic Material

Diode: Ohmic or Not Ohmic?

Guess the Resistors!