# Shared Flashcard Set

## Details

AS Physics - Electricity
G482 Elecricity Cards
17
Physics
Not Applicable
01/29/2009

Term
 Charge of electron
Definition
 1.6x10^-19 Coulombs
Term
 Ohm's Law
Definition
 The current through a conductor is proportional to the applied P.D. provided physical constants such as temperature remain constant.
Term
 Resistivity
Definition
 rho = RA/l (l=length, R=resistance, A=cross-sectional area)
Term
 kilowatt-hour
Definition
 A power of 1000 watts for 3600s, therefore 3600000J.
Term
 drift velocity
Definition
 The average velocity of an electron as it travels through a conductor due to a P.D.
Term
 Electric charge
Definition
 Current x time (measured in Coulombs)
Term
 LDR
Definition
 Light Dependent resistor
Term
 watt
Definition
 unit of power 1w = 1 J/s
Term
 e.m.f
Definition
 energy transferred per unit charge when one form of energy is transferred into lectrical energy, measured in volts (V)
Term
 resistance
Definition
 property of a copmponent which regulates current passing through
Term
 NTC thermistor
Definition
 Component which drops in resistance with increasing temperature
Term
 p.d.
Definition
 electrical energy transferred per nit charge when electrical energy is converted into another form
Term
 conventional current
Definition
 model used to describe movement of charge in a circuit: + to -
Term
 the Volt
Definition
 When one coulomb of charge gains one Joule of energy, the accelerating potential difference is one Volt.
Term
 Kirchoff II
Definition
 The sum of the e.m.fs = sum of P.Ds (IxR) in a closed loop
Term
 Kirchoff I
Definition
 Sum of the currents entering and leaving a junction is zero. (Sum entering = sum leaving)
Term
 Terminal P.D.
Definition
 P.D. measured across the terminals of a cell using an ideal voltmeter.
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