4.2 Electrical Quantities Flashcards
(34 cards)
unit of measuring charge
coulombs (C)
what is an electric field
the region in which another charge will experience a force
direction of electrical field lines
positive charges- away
negative charges- towards
conductor
material that allows charge to flow through it
insulator
material that does not allow charge to flow through it
electric current
flow of charge- can happen between two oppositely charged conductors connected by a wire
current in terms of charge
charge per second
formula for charge
Q = I x t charge = current x time
unit of measuring current
ampes (A)
device for measuring current
Ammeter
cause of current
flow of electrons
direction of flow of electrons
negative to positive
direction of flow of current
positive to negative
electromotive force (EMF)
Potential Difference (Voltage) of the power source in a circuit
unit for measuring EMF
volts (V)
EMF in terms of energy
energy per coulomb (charge)
potential difference
the amount of energy transferred by each unit of charge passing between those two points
unit for measuring potential difference
Volts (V)
relationship between energy and potential difference
1 Volt = 1 joule per coulomb
device for measuring potential difference
Voltmeter (in parallel)
resistance
opposition to current
measuring unit of resistance
ohm (the sign that looks like a horse shoe)
formula for resistance
potential difference/current
to increase resistance
longer wire
