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Science
Engineering
Electrical Engineering
physics/ch. 23./electric current
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Gravity
Terms in this set (53)
high to low
heat energy flow from _____ temperature to _____ temperature
potential difference
the difference in electric potential (electric potential energy per charge) between 2 points; also called voltage difference or simply voltage. free charge flows when there is a difference and will continue to flow until both points reach a common potential
potential difference
the flow of charge persists for as long as there is a ______
electric current
flow of electric charge that transports energy from one place to another; measured in amperes
electrons
in circuits of metal wires, _____ make up the flow of charge
amperes
rate of electrical flow
pumpm
a sustained current requires a suitable _____ to provide a difference in electric potential
pumps
generators or chemical batteries are examples of _____
voltage
difference in electric potential
volts
unit of electric potential difference
voltage
across a circuit
charge
through a circuit
electrical resistance
opposition of an object to the flow of electric charge through it
ohms (omega symbol)
unit for resistance
less
thick wires have (more or less?) resistance than thin wires
more
longer wires have (more or less?) resistance than short wires
yes
can electrical resistance depend on temperature?
superconductors
zero resistance
ohm's law
the current in a circuit is directly proportional to the voltage impressed across the circuit and is inversely proportional to the resistance of the current
directly
current is _____ proportional to voltage
inversely
current is _____ proportional to resistance
current
voltage/resistance = ?
amperes
volts/ohms = ?
electric shock
current passing through the body
direct current (DC)
electric current in which the flow of charge is always in one direction
direct current
one direction
direct
a battery produces _____ current
alternating current
electric current that rapidly reverses in direction
120V
voltage of ac in north america
220V
voltage of ac in europe
ac
household current is _____
dc
current in a battery-operated device, such as a laptop computer, is _____
diode
a tiny electronic device that acts as a one-way valve to allow electron flow in only one direction
the speed of light
current is established thru the wires nearly at _______ (what speed?)
electric field, not electrons
what travels nearly at the speed of light when a current is established?
no
can you buy electrons?
yes
can you buy energy?
electric power
the rate of electric energy transfer or the rate of doing work, which can be computed a the product of current and voltage
power
current x voltage =
watts
amperes x volts =
energy
power x time =
heat
incandescent light bulb mostly emits _____
circuit
any path along which electrons can flow
gaps
for a continuous flow of electrons, there must be a complete circuit with no _____
series
form a single pathway for electron flow between the terminals of the batter, generator, or wall socket
parallel
form branches, each which is a separate path for the flow of electrons
series circuit
an electric circuit with devices connected in such a way that the electric current thru each of them is the same
greater
the (greater or less?) the current, the brighter the lamp glows
characteristic of series circuit
- single pathway
- same current
- total resistance is sum of individual resistances
series circuit
if one device fails, current in while circuit ceases
parallel circuit
an electric circuit with two or more devices connected in such a way that the same voltage acts across each one and any single one completes the circuit independently of the others
characteristics of parallel circuits
- voltage is same across each device
- ohm's law applies separately to each branch
- as the number of parallel branch is increases, the overall resistance of the circuit is decreased
ughhh i'm tired of this
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Verified questions
ENGINEERING
Saturated ethylene glycol at 1 atm is heated by a horizontal chromium-plated surface which has a diameter of 200 mm and is maintained at 480 K. Estimate the heating power requirement and the rate of evaporation. What fraction is the power requirement of the maximum power associated with the critical heat flux? At 470 K, properties of the saturated liquid are $\mu=0.38 \times 10^{-3} \mathrm{N} \cdot \mathrm{s} / \mathrm{m}^{2}, c_{p}=3280 \mathrm{J} / \mathrm{kg} \cdot \mathrm{K}$, and Pr=8.7. The saturated vapor density is $\rho=1.66 \mathrm{kg} / \mathrm{m}^{3}$. Assume nucleate boiling constants of $C_{s, f}=0.01$ and n=1.0.
ENGINEERING
An uncrowned straight-bevel pinion has 22 teeth, a module of 4 mm, and a transmission accuracy number of 5. The pinion and the gear are made of through-hardened steel, both having core and case hardnesses of 180 Brinell. The pinion drives the 24-tooth bevel gear. The shaft angle is $90^{\circ}$, the pinion speed is 1800 rev /min, the face width is 2 5 mm, and the normal pressure angle is $20^{\circ}$. Both gears have an outboard mounting. Find the power rating based on AGMA pitting resistance if the life goal is $10^{9}$ revolutions of the pinion at 0 .999 reliability.
ENGINEERING
The Mach number for a body moving through a fluid with velocity V is defined as VIc, where c is the speed of sound in the fluid. This dimensionless parameter is usually considered to be important in fluid dynamics problems when its value exceeds 0.3. What would be the velocity of a body at a Mach number of 0.3 if the fluid is $\textbf{(a)}$ air at standard atmospheric pressure and $20^{\circ} \mathrm{C}$, and $\textbf{(b)}$ water at the same temperature and pressure?
ENGINEERING
Determine the minimum horizontal force P required to hold the crate from sliding down the plane.The crate has a mass of 50 kg and the coefficient of static friction between the crate and the plane is $\mu_{x}=0.25$.