(definitions) chapter 16 - current electricity

Question 1

define current

Answer 1

current is the rate of flow of charge

Question 2

explain what one ampere means

Answer 2

one ampere is the current produced when one coulomb of charge passes a point in a circuit in one second

Question 3

define emf (electromotive force)

Answer 3

the electromotive force of an energy source is the
work done by the source to drive a unit charge around a complete circuit

Question 4

define potential difference

Answer 4

the potential difference across a component in an electric circuit is
the work done to drive a unit charge through the component

Question 5

define electrical resistance of a material

Answer 5

ratio of voltage across the material to the current flowing through it

Question 6

state the relationship between R (resistance) and L (length) of a wire of constant cross-sectional area

Answer 6

R is directly proportional to L

Question 7

state the relationship between R (resistance) and cross-sectional area A of a wire of constant length

Answer 7

R is inversely proportional to A