Ohm's Law and Resistance Flashcards
resistor
a device with a specific resistance that is used to control current
conventional current
the flow of positive charges that move from a higher to lower potential energy
an ampere is equal to a
coulomb/second
least resistance
short, fat, and cold
a watt is equal to a
ampere* volt OR Joule/Coulomb
an ohm is a
volt/ampere
current is measured in
amperes
power is measured in
watts
resistance is measured in
ohms
electric current
flow of charged particles
electric current is caused by
electric potential difference
electric potential difference exists because there is
an electric field
electric circuit
a closed loop or conducting path that allows flow of charge
power
the rate of energy transfer OR how quickly work is done
voltmeter measures
voltage (electrical potential difference)
a voltmeter is connected to a circuit
in parallel to a device so you can measure the difference in electrical potential energy/ coulomb before and after electrons go through it
ammeter measures
current
a ammeter is connected to a circuit
in series with a device because current is the same everywhere in a series current
direct current
charges move in one direction (overall)
*
Generally, this type of current is supplies by a battery
alternating current
charges vibrate back and forth because the potential difference provided by the voltage source is constantly chaning sign
flow of charged particles
Electric current
a closed loop or conducting path that allows flow of charge
Electric circuit
