Voltage, Current, Resistance Flashcards
voltage= work done per __ __ _
unit of charge
voltage has an energy component
true/false
true
a resistor is any device that allows electrons to ____
lose energy
amount of potential energy a power source can lose is called _____
total voltage
what is Kirchhoff’s voltage law?
sum of all voltages in a circuit must equal zero
sum of V=0
total voltage loss from power source= voltage gain by ____
resistor
1st law of thermodynamics (conservation of energy) states (in terms of voltage)
you cannot lose energy from the power source without losing power from the resistors
4 factors of resistance to electron flow:
- type of material
- temperature
- length
- cross-sectional area
current: number of ___ that pass a point in a conductor per ____
electrons, second
what is current measured in?
amperes (coulomb’s per second)
what device measures current? are they placed in series or parallel?
ammeters, placed in series
voltage and current have a relationship with _____
resistance
what is Ohm/s law as seen on a reference sheet?
V=IR
Kirchhoff’s law
In a series circuit, voltage is ___
shared
Kirchhoff’s law
In a series circuit, current is ___
same
Kirchhoff’s law
In a parallel circuit, voltage is ___
same
Kirchhoff’s law
In a parallel circuit, current is ___
shared
resistance laws:
in series: resistance is equal to
R1+R2
1/R1+1/R2
R1+R2
resistance laws:
in parallel: resistance is equal to
R1+R2
1/R1+1/R2
1/R1+1/R2
