Test 2 Review Summer 2008
Wednesday, 09-Jul-2008 6:31 PM
Chapter 24
Capacitance
Cylindrical (coaxial type cable for transmiting) & Spherical
Storage of Electrical Energy
Area of Parallel Plate Capacitors
Capacitance of the Earth
Capacitors
Series & Parallel
Potential Energy Stored in a Capacitor
Equivalent Capacitance
Capacitor Combinations
Energy stored in capacitors
Electric Batteries
Circuits
Dielectrics
Breakdown Voltage
Electric Battery
Chapter 25
Mean Free Path & Mean Free Time (electron collision)
Electric Current
Flashlight & Headlight Bulb Resistance
Ohm's Law
Resistance & Resistors
Resistivity & Conductivity
Human Resistance Wet and Dry
Electric Power
Electric Heater, Electric Frying Pan
EMF & Terminal Voltage
Internal Battery Resistance
Resistors in Series & Parallel
Kirchhoff's Rules
multiple choice potential... questions:
Capacitors block surges of charge and energy protecting circuits
Tiny capacitors serve as memory for "1" & "0" of binary code in RAM
Capacitance C does not depend generally on q or V
Electrodes, electrolyte, & terminals
Ammeters, Volt meters, Ohmmeters, & Galvanometers
Resistance in light bulbs
Joule Heating
Ideal Battery, Internal Resistance
Emf of battery is the maximum possible voltage the battery can provide between its terminals.
Source of emf provides energy to the circuit
If device is another battery, i.e. charged by a source of emf, then the energy transferred appears as chemical energy newly stored in battery.
If the device is a resistor, the transferred energy appears as internal energy (INCREASE IN TEMPERATURE) & is transferred to the environment as heat.
If the device is a capacitor, the energy transferred is stored as potential energy in its electric field.
In contrast to ideal batteries, real batteries have an internal resistance which reduces the terminal voltage pf the battery & limits the current that can flow into a circuit.
If R is small, the current I increases, & potential difference between the battery terminals decrease.
A 1.5-V battery has a terminal voltage difference of 1.5-V only when NO current is flowing through the battery.
When a battery is connected to a radio etc..., the voltage difference between the terminal will be less than 1.5 V
The emf of a battery is equal to the voltage across its terminals when the current is:
The emf is equivalent to the __________ of the battery.
For a series combination of two resistors, the currents are (the) _______ in both resistors;
The equivalent resistance of a series connection of resistors is the numerical sum of the individual resitances and is always ________ than any individual resistance.
When resistors are connected in parallel, the potential differences across the resistors is (the) _______.
The Junction rule states that the sum of the currents entering any junction in a circuit must _______ the sum of the currents leaving that junction.
The Loop rule states that the sum of the potential differences across all elements around any closed circuit loop must be: __________
Gustav Kirchhoff German Physicist (1824-1887) invented the: __________
The _________ is the "main component" in analog meters for measuring current and voltage.
A device that measures current is called a(n): __________
A device that measure potential difference is called a: __________
An ideal voltmeter has ________ resistance so that no current exists in it.
Capacitance is always a ___________ quantity.
Capacitance is a measure of a capacitor's ability to ___________ charge.
A dielectric is a ___________ material such as rubber, glass, or waxed paper.
The name __________ surface is given to any surface consisting of a continous distribution points having the same electric potential.
Equipotential surfaces must always be ____________ to the electric field lines passing through them.
A phenomenom known as ______________ is often observed near a conductor such as high-voltage power line. When the electric field in the vicinity of the conductor is sufficiently strong, electrons resulting from random ionizations of air molecules near the conductor accelerate away from their parent molecules.
The SI unit of capacitance is the _________.
A short circuit occurs when almost ________ resistance exists between two points at different potentials.
