Module 3: Current, Resistance, and Electromotive Force Flashcards
this has infinite resistance
ideal voltmeter
this has zero resistance
ideal ammeter
The current in a ________________ is the same at every point
simple loop
this is equal to the emf E divided by
the internal resistance r
short-circuit current
There is a ____________________ if the current flows through the element in the direction from low to high potential
power output
there is a ____________________ if the current flows from high to low potential
power input
Increasing the resistance R causes a ________________ in the power
input to the resistor
reduction
it is usually transmitted through conductors (metal wires, etc.)
current
If the current follows a conducting path that ends in a closed loop, this is termed as an?
electric circuit
in this case, there is no electric field inside a conductor, and the current is zero
electrostatic case
When exposed to a constant field 𝐸 w/in the conductor, electrons experience?
electrostatic force
these acts as obstacles that prevent electron from accelerating continuously
positive ions
if the conductor is exposed to constant electric field, the electron’s motion still remains mostly random, but it gains a very slow ____________________ in the direction of the force
drift velocity
what does move the electrons causing the electrical circuits to activate so fast
electric field
Direction of current: defined by convention as the direction
of flow of?
positive charge
Current in circuits is
usually treated as what quantity?
scalar quantity
who was the French scientist who assigned the unit of current I is ampere
Andre Marie Ampere
Current can be expressed in terms of the _________________ of the moving charges
drift velocity
a conductor may have multiple?
charge carriers
this may have multiple charge carriers
conductor
a conductor may have multiple charge carriers of
different?
- concentrations
- magnitudes
- velocities
these currents are constant in time
steady currents
these can only form if the conducting path of the
current is a closed loop (aka a complete circuit)
steady currents
Steady currents can only form if the conducting path of the current is a?
closed loop (aka complete circuit)
