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Gravity
Introduction
Terms in this set (41)
An electrical circuit contains, at a minimum
A voltage source, a load, and conductors to carry the electrical current
A type of subatomic particle with a positive charge is a(n) ____
Proton
Which of the following is considered an insulator
a. Gold
b. Copper
c. Silver
D. Porcelain
The voltage commonly supplied to a residence by the local utility is ____
240 Volts
Another term used for voltage is ____
emf
The color band that represents tolerance on a resistor is the ____
4th band
In a parallel circuit, the total resistance is ____ the smallest resistance.
less than
Circuit continuity is checked using the ___ function of a multimeter.
ohmmeter
The power in a circuit with 120 volts and 5 amps is ____
600 volts; 120 X 5; P=IE
Current is measured in units called ____
amperes
Joules are___
units of work
All conductors have ___
Some resistance
To find voltage when both current and resistance are known, use the formula ___
E=IxR
A resistor with a color code of yellow, orange, red, and silver has a tolerance of
3870 - 4730 ohms
Ammeters measure
Current
The charged particles of an atom are called
Protons and Electrons
Conductors have ____or fewer valence electrons
Three
The sum of the difference in potential of all the charges in an electrostatic field is called ____
(EMF)Electromotive Force or Voltage
Electric charge is measured in
Coulombs
Resistance is measured in
Ohms
Find the resistance when the voltage is 120v and the current is 6A
20 ohm; R=E/I; 120 / 6 = 20
An electromagnetic device used to control a mechanical device such as a valve is called a_____
Solenoid
A device containing one or more coils of wire wrapped around a common core is call a____
transformer
A ____ is an electro-mechanical component used as a switching device
Relay
The change in voltage across a component is called a____
Voltage drop
A ____circuit has only one route for current flow
Series
a ____ is a drawing in which symbols are used to represent the components in a system
Schematic
A ___ is a component that normally opposes current flow in a DC circuit
Resistor
____ is the rate of doing work or the rage at which energy is used or dissipated
Power
_____ is a statement of the relationship between current, voltage, and resistance in an electrical circuit.
Ohms law
An ___ is a material through which it is difficult to conduct an electric current
Insulator
Consisting of two or more cells, ____ convert chemical energy into electrical energy.
Batteries
The prefix used to indicate one million is___
Mega
The prefix used to indicate one thousand is ____
Kilo
____ is any substance that has mass and occupies space.
Matter
An ____is a negatively charged particle that orbits the nucleus of an atom
Electron
The outermost ring of electrons orbiting the nucleus of an atom is known as the ____
Valence Shell
Found in the nuclei of atoms, ____ are electrically positive particles and ____ are electrically neutral particles
Protons; Neutrons
The ____ is the center of an atom
Nucleus
The ___ is the smallest particle of an element that will still retain the properties of that element
Atom
The basic unit of measurement for electrical power is the ____
Watt
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Verified questions
ENGINEERING
Water is to be transported in a 4-m-wide rectangular open channel. The flow depth to maximize the flow rate is (a) 1 m(b) 2 m(c) 4 m(d) 6 m(e) 8 m
ENGINEERING
A uniform bar of n-type silicon of $2-\mu \mathrm{m}$ length has a voltage of 1 V applied across it. If $N_{D}= 10^{16} / \mathrm{cm}^{3}$ and $\mu_{n}=1350 \mathrm{cm}^{2} / \mathrm{V} \cdot \mathrm{s},$ find (a) the electron drift velocity, (b) the time it takes an electron to cross the $2-\mu \mathrm{m}$ length, (c) the drift-current density, and (d) the drift current in the case that the silicon bar has a cross-sectional area of $0.25 \mu \mathrm{m}^{2}.$
ENGINEERING
A parallel circuit (i.e., all elements are in parallel with one another) has a $60-\Omega$ resistance, a $20-\Omega$ resistance, an unknown resistance $R_x$, and 30 mA current source. The current through the unknown resistance is 10 mA. Determine the value of $R_x$.
ENGINEERING
Liquid water at ambient conditions, 14.7 lbf/in.2, 75 F, enters a pump at the rate of 1 lbm/s. Power input to the pump is 3 Btu/s. Assuming the pump process to be reversible, determine the pump exit pressure and temperature.