Details

Title: AS Physics - Electricity

Description: G482 Elecricity Cards

Total Flash Cards: 17

Created: 01/29/2009 07:38:59

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Cards in this set:

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.