Electricity Test Flashcards
Static Electricity
A stationary charge. It is standing without motion
What determines a Positive Charge, or a negative charge?
Matter is essentially neutral. However, in an event where an excess negative charge or positive charge is transferred to an object, the object will gain the charge that is in excess
Electrical Conduction in an Electroscope
A conductor is a material that transfers charges easily
In An electroscope: A negatively charged rod touches the electroscope. The positive charges travel up to the knob. The electrons go down to the leaves, and the leaves repel eachother and become negative
Electric Induction in an electroscope
Induction is when you create an electric charge on an object without touching it (temporary )
- Take negatively charged rod and keep it close to the knob
- The positive charge goes up to the knob.
- Th enegative charge goes to the leaves and then they repel eachothe r
Ground in an Electroscope
Ground: A connection where some charge can go without making impact
- Negative charge is held next to the knob.
- Positive charge goes up the the knob
- The negative charge goes to the leaves and to the wire.
Define
A. Conductor
B. Insulator
- Ground
Conductor: A material in which charges can move freely.
Ex. Wire, any metallicly bonded substance
Insulator: A material which blocks the movement of charges
Ex. Wood
Ground: A material that can hold charge without any significant change in its charge
Ex. Wire
What is Direct Current?
The current runs in one direction. Direct current is found in many low voltage appliance. Also, where batteries were used
What is Alternating Current
Alternating Current is: Current that runs in one direction for 1 sec. and then goes back in the original direction
This can be found in power lines
How does Dry and Wet Cell Battery work
- Container that is filled with acid
- Has 2 electrodyes in it. One is positive and one is negative
- If you run a current through it, then it will produce a chemical reaction in which one of the electrodyes is eaten at, and the remains settle onthe other
- There is energy..produced
- You connect a the two sides and you complete a circuit
IN A DRY CELL BATTERY, THE ACID IS PASTE
What kind of charges attract eachother? What kind repell
UNlike charges attract, like charges repel
What is Voltage, Current, and Resistance?
What are the units and symbols
Voltage: Electrical potential energy. The units are volts and the symbol is V
Current: Rate of movement of electric charge through a conductor. The units are amperes and the symbol is I
Resistance: Force that is opposed to movement of current. The units are ohms and the symbol is 1 ohm
What are Amps, Volts and Ohms?
Amps: Units for current, an ampmeter is used to measure
Volts:Unit used to measure Voltage, a voltmeter is used
Ohm: The resistance units, an ohmmeter
What is the relationship between resistance and conduction
V/I=R
What is Ohm’s Law?
When moving electrons collide, with atoms of the material, some of the kentic energy is transferred to the atoms. This energy transfer causes the atoms to vibrate and the material warms up. A conductors resistance indicates how much the motion of the charges within is rsisted within the it is resisted by the collisions. (RESISTOR IS A CONDUCTOR THAT AS A SPECIFIC TYPE OF RESISTANCE)
Ohms Law is V=IR you can plug values in to find the missing things
What is a series circuit? Parallel Cuircuit? What is an Incomplete?
