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Flashcards in physics chapter 4 part 1 Deck (58)
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Define electrostatics

The study of stationary electric charges

1

Define electrodynamics

The study of electric charges in motion aka electricity

2

Know three ways an object can be electrified

◾️friction
◾️contact
◾️induction

3

Define electric potential

The ability to do work because of separation of charges

4

Define current

An expression of the flow of electrons in a conductor

5

Define resistance

The property of an element in a circuit that resists or impedes the flow of electricity

6

What is electric potential measured in?

Volts

7

Define volt

The potential difference that will maintain a current of 1 ampere in a circuit with a resistance of 1 ohm

8

What is volt an expression of?

The difference in electric potential between two points

9

What is current measured in?

Amperes

10

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.

11

What surrounds electrical current?

Magnetic field

12

What are the 2 types of current?

◾️direct current
◾️alternating current

13

What is DC?

Type of current that flows in only one direction

14

How do electrons flow with DC?

Negative terminal to positive terminal

15

What type of current supplies the X-ray tube?

Pulsating direct current

16

What's AC?

Current that changes direction in cycles as the electric potential of the source changes

17

What is resistance measured in?

Ohms

18

Define ohm

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

19

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

20

What 4 things the amount of resistance in a conductor depends on?

◾️material
◾️length
◾️cross sectional area
◾️temperature

21

What's a conductor?

Materials with an abundance of free electrons that allow a relatively free flow of electricity

22

What are some examples of a conductor?

◾️copper
◾️gold
◾️water

23

What's an insulator?

Has no free electrons and therefore not good conductors of electricity

24

Examples of insulators

◾️rubber
◾️glass
◾️ceramic
◾️wood

25

What's an electric circuit?

Closed pathway composed of wires and circuit elements through which electricity may flow

26

What must happen for electricity to flow?

The pathway for electricity must be closed

27

What's a closed circuit?

The pathway for electricity must be closed for electricity to flow

Switch is on

28

What is an open circuit?

A circuit In which the pathway is broken, such as when a switch is turned off

29

What's a battery?

A device that produces electrons through a chemical reaction, stores an electric charge for the long term and provides an electronic potential