# Shared Flashcard Set

## Details

Physics Definitions and Equations
Everything from 5.1 - 5.5 (excluding HL material from 5.3)
25
Physics
10/17/2011

Term
 Coulomb's Law
Definition
 The electric force between two point charges q and Q is given byF= kqQ/r^2
Term
 Electric force experienced by charge from electric field
Definition
 E = F/QNC^-1
Term
 Electric field at a point
Definition
 Ep = kQ/r^2
Term
 Potential at a point
Definition
 V = W/QMeasured in Volts, or JC^-1
Term
 Potential energy of charge
Definition
 U=qVMeasured in Volts
Term
 Electric field between parallel plates
Definition
 E = V/dVm^-1 volt meter
Term
 Electronvolt
Definition
 1 eV = 1.6 x 10^-19 C x 1 VElectron charge per 1 volt of potential
Term
 A charge q in an electric field of magnitude E will experience a force of magnitude...
Definition
 F = qE
Term
 Equation for work done in moving a charge q across a potential difference V (delta V)
Definition
 W = qV (delta V)
Term
 Law of conservation of charge
Definition
 1/2mv^2 + qV (A) = 1/2mv^2 + qV (B)Left hand side is A, right hand side is B
Term
 Electric Potential
Definition
 The work per unit charge required to bring a positive test charge from far away to the point of interest. (Volts or JC-1)
Term
 Equation for potential difference
Definition
 Work that must be done to bring a charge q from point A to point B isW = q x (Vb - Va)
Term
 Electric Current
Definition
 The amount of charge that moves through the cross-sectional area of a wire per unit interval of time.I=Q/t
Term
 Motion of electrons in current
Definition
 Electric field forces electrions to drift in one direction - overwhelming the electrons that collide with atoms and ions from the conductor itself, forcing them to 'drift' in one direction. This is current.
Term
 Electric Resistance
Definition
 Potential difference across its ends divided by the current flowing through it. Given by:R = V/I
Term
 Ohm's Law
Definition
 When the temperature of a metallic conductor is kept constant, the current through the conductor is proportional to the potential difference across it.I ∝ VGraph of this will be straight line passing through origin.
Term
 Relationship between Resistance, Length and Area
Definition
 R ∝ L/AThe electric resistance of a wire is proportional its length L, and inversly proportional to the cross-sectional area A.
Term
 Potential drop
Definition
 The phenomena that occurs when electric current passes through a resistor; the potential at a point afterward is less than at a point before.V = IR can be used to find this.
Term
 Equation(s) for Electric Power
Definition
 P = VIP = RI^2P = V^2 / R
Term
 emf
Definition
 Ratio of work done by non-electrical forces, W, to a quantity of charge q that moves from one terminal of the battery to the other.Measured in Volts. emf = W/q
Term
 Resistances of series circuits
Definition
 Are added up; R-total = R1 + R2 + R3 + ...Can be replaced with one large resistor of R - total
Term
 Resistances of parallel circuits
Definition
 Circuit splits for the seperate paths with resistors. Law of conservation of charge means charge is same at beginning and end of split.1/R-total = 1/R1 + 1/R2 + 1/R3 + ...
Term
 Ammeters
Definition
 Devices used to measure the current (amperes) in a circuit. They must be in series to resistors, and must have zero resistance to work effectively (ideal).
Term
 Voltmeter
Definition
 A device used to measure the potential difference across a resistor. It must be connected in parallel to the resistor. Ideally, it should have infinite resistance; to take no current when connected to a resistor.
Term
 Potential Divider
Definition
 A device that is used to determine the current-voltage characteristic of some device with resistance R. Can affect the amount of current going from different parts of the circuit through adjustment.
Supporting users have an ad free experience!