Flashcards in physics chapter 4 part 1 Deck (58)
The study of stationary electric charges
The study of electric charges in motion aka electricity
Know three ways an object can be electrified
Define electric potential
The ability to do work because of separation of charges
An expression of the flow of electrons in a conductor
The property of an element in a circuit that resists or impedes the flow of electricity
What is electric potential measured in?
The potential difference that will maintain a current of 1 ampere in a circuit with a resistance of 1 ohm
What is volt an expression of?
The difference in electric potential between two points
What is current measured in?
Define ampere (& it's relationship to volt definition)
May be defined as 1 coulomb flowing by a given point in 1 second.
◾️The amount of current flowing with an electric potential of 1 volt in a circuit with a resistance of 1 ohm.
What surrounds electrical current?
What are the 2 types of current?
What is DC?
Type of current that flows in only one direction
How do electrons flow with DC?
Negative terminal to positive terminal
What type of current supplies the X-ray tube?
Pulsating direct current
Current that changes direction in cycles as the electric potential of the source changes
What is resistance measured in?
The electrical difference equal to the resistance between two points along a conductor that produces a current of 1 ampere when a potential difference of 1 volts applied
Know ohms law
Stated that the potential difference (voltage) across the total circuit or any part of that circuit is equal to the current (ampere) multiplied by the resistance
What 4 things the amount of resistance in a conductor depends on?
◾️cross sectional area
What's a conductor?
Materials with an abundance of free electrons that allow a relatively free flow of electricity
What are some examples of a conductor?
What's an insulator?
Has no free electrons and therefore not good conductors of electricity
Examples of insulators
What's an electric circuit?
Closed pathway composed of wires and circuit elements through which electricity may flow
What must happen for electricity to flow?
The pathway for electricity must be closed
What's a closed circuit?
The pathway for electricity must be closed for electricity to flow
Switch is on
What is an open circuit?
A circuit In which the pathway is broken, such as when a switch is turned off