# Shared Flashcard Set

## Details

Electric Currents
Electric Currents
13
Physics
11/14/2008

Term
 electrolyte (2)
Definition
 conductive solutiondissimilar metals connected by this solution is a basis for batteries
Term
 Battery (4)
Definition
 transforms chemical energy into electrical energychemical reactions create a potential differencemaintain constant potential difference (V), current (I) variesa source of emf in parallel
Term
 Electric Current, I (2)
Definition
 rate of FLOW of charge through a conductorI = ΔQ/Δt1 Ampere = 1 C/s
Term
 Current flow
Definition
 conventional flow says electrons flow + to - but electrons flow - to +
Term
 Ohm's Law
Definition
 resistance is independent of voltageR = V/IOhm (Ω) = volt/amp
Term
 Resistivity (ρ) (4)
Definition
 R = ρ L/Aρ is characteristic of the materialincreases with tempsemiconductors can decrese with temp
Term
 Power unit?
Definition
 P = QV/t = IV = I2R = V2/Rmeasured in watts
Term
 Energy (kWh)
Definition
 power times time
Term
 Fuses or Circuit breakers (2)
Definition
 disconnect when current goes above predetermined value. Wires in home have low resistance; if power is high enough, current will increase, wires will get hot enough to start a fireFuses can be used once; circuit breakers are reset
Term
 Superconductivity
Definition
 currents can flow through these materials for years without decreasing, but at very low temps
Term
 Hose vs. DC
Definition
 pressure = potential (V) = voltsrate of flow = current (I) = ampsfriction or cross-section area (larger hose, less friction) = resistance (r) = ohms
Term
 AC Power
Definition
 P = I2Rsin2ωt
Term
 Gauss's Law
Definition
 The net electric flux through any closed Gaussian surface is equal to the net charge within the surface divided by the electric permittivity, €oΦE = Qenclosed/€o
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