Electricity Flashcards
(31 cards)
the best electrical conductors are…
metals
the best electrical insulators are…
air, glass, plastic, wood
lighting is a buildup of…
static electricity
device that detects the presence of electric charges
electroscope
positively charged particles are called
protons
particles with no charge are called
neutrons
negatively charged particles are called
electrons
an electric current is
the net movement of electric charges in a single direction
true or false: constant random motion of electrons stops when a current flows
false: electrons are always in constant random motion
electric current is measured in
amperes / amps
voltage difference is measured in
volts
true or false: charges flow from a high voltage to a low voltage
true
a voltage difference is
the force that causes electric charges to flow
a circuit is
a closed path an electric current follows
three types of batteries are?
dry-cell, wet-cell, lead-acid
which battery has liquid in it?
wet-cell
which battery is used in your car?
lead-acid
which battery has a paste?
dry-cell
dry-cell batteries have what two elements?
carbon rod (positive), and zinc (negative)
resistance is
the tendency of a material to oppose the flow of electrons
resistance is measured in
ohms ( Ω )
electric resistance usually increases when
the temperature of that object increases
resistance also increases when the wire length
increases
which has more electrical resistance: conductors or insulators?
insulators
