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Electrical Charge
AC/DC
History
Formulas and math
Definitions
100
the action generated by like forces
What is repel?
100
Direct Current
What is the current that is one direction?
100
He worked with Tesla on alternating and direct current?
Who is Thomas Edison?
100
voltage/resistance
What is current?
100
electricity at rest; slow-moving electric charges
What is electrostatics?
200
the action the opposite charges make
What is attract?
200
Alternating current
What is the current that switches back and forth?
200
scientist who experimented with lightning
Who is Benjamin Franklin?
200
1 volt/ohm
What is an ampere?
200
attraction or repulsion between electrons and protons
What is electrical force?
300
An object that has unequal numbers of electrons and protons
What is an electrically charged object?
300
by rotating magnets
How do you make alternating current?
300
the year wires were finally used to send messages
What is 1774?
300
used to measure current
What are amps?
300
electrons are neither created nor destroyed; simply transferred
What is conservation of charge?
400
By friction and contact
How can an electric charge be transferred?
400
1. The generation of A.C. is cheaper than that of D.C. 2. A.C. machines are simple , robust and do mot require much attention for their repairs and maintainance during their use. 3. Wide range of voltages are obtained by the use of transformer. 4. The magnitude of current can be reduced by using an inductance or a conductor without any appreciable loss of energy 5. A.C. can easily be converted into D.C. with the help of rectifiers. 6. When A.C. is supplied at higher voltages in long distance transmission , the line losses are small compared to a D.C. transmission
What are advantages of A.C. over D.C.?
400
the type of current Tesla and Westinghouse finally used
What is alternating current?
400
v = (I)(R)
What is ohm's law?
400
Materials through which an electric charge can flow...and cannot flow
What are conductors and insulators?
500
for charged particles or objects that are small compared with the distance between them, the force between the charges varies directly as the product of the charges and inversely as the square of the distance between them.
What is Coulomb’s law?
500
1. Peak value of A.C. is high and it is dangerous to use so better insulation is required. 2. It attracts person who touches it unlike D.C. which gives a repelling shock. 3. An A.C. is transmitted from surface of the conductor and hence need several strands of thin wires insulated from each other.
What are the disadvantages of A.C. over D.C.?
500
rubbed against fur to attract things
What are stones?
500
(1 ampere)(1 volt)
What is 1 watt?
500
one side of an atom is induced to be slightly more positive or negative than the other
What is electrically polarized?