electricity Flashcards
(37 cards)
materials lose electrons to become?
positive
materials gain electrons to become?
negative
what do like charges do to eachother?
they repel each other
opposite charges?
attract
electrical current (flow of charge) allows energy to?
be carried around circuits
components in circuits can be connected in?
series or
parallel
what does a voltmeter measure
voltage
what does an ammeter measure
current
what do the letters stand for in the relationship Q= It
Q- charge (C, coulombs)
I- current (A, amps)
t- time (s, seconds)
what properties does alternating current (a.c.) have?
changes direction repeatedly many times per second. this gives a frequency
what properties does direct current (d.c.) have?
flows in only one direction around the circuit, never changing direction. has no frequency
both types of current supply (a.c. and d.c.) can be displayed using an?
oscilloscope
A.C. supply’s are commonly provided by?
the electrical main (from wall sockets) , generator
D.C. supplies are provided by?
batteries, solar panels
what is an electrical field?
an electrical field is the area surrounding an electrical charge where other charges can experience a force
direction of field lines shows how a force would act on a?
positive charge in the electrical field
two parallel plates with opposite charges will produce an electrical field with?
parallel field lines
the potential difference for an ELECTRICAL FIELD, is a measure of the?
energy per unit charge
i.e. 1 volt = 1 joule per coulomb
what do the letters stand for in the relationship V= E/Q
V- potential difference (voltage)
E- energy (joules, J)
Q- charge (coulombs, C)
for a source of ELECTRICAL ENERGY what is potential difference a measure of?
the energy SUPPLIED to each coulomb of charge
for a COMPONENT IN A CIRCUIT what is the potential difference a measure of?
the energy transferred by each coulomb of charge
how are voltmeters connected
in parallel
how are ammeters connected?
in series
in a series circuit the current is?
equal at all points
Is=I1=I2=I3…
