vocabulary
what is the flow of electric charge called
current
in which type of circuit is there only one path for electricity
series
True or False: water is a good conductor of electricity
what formula relates voltage, current and resistance
V=
name one conductor
copper, aluminum, gold
what unit is current measured in
Amperes (amps)
in which type of circuit does each device have its own path?
parallel
what should you do before reparing an electrical device?
unplug it
what formula calculates power
name one insulator
plastic, rubber, wood
what unit is voltage measured in
volts
if one bulb burns out in a series circuit, what happens?
All bulbs go out
name one elctrical hazard at home
frayed wires,overloaded outlets ,water near electronics
A device uses 10 V and 2 A. what is its power?
20 W
why do power cords have plastic around the wires
to insulate and protect users from shock
what opposes the flow of electricity
Resistance
if one bulb burns out in a parallel circuit what happens
the others stay on
why should you never use electrical devices near water
risk of electric shock
A circuit has 12 V and 3 ohms resistance what is the current
4 A
which bulb would be brighter: one in a circuit with high resistance or the one with low resistance
low resistance
what is the unit of resistance
Ohms
why are home wired in parallel
Appliances can work independently
what devices protect a circuit from too much current
fuse or a circuit breaker
A circuit has a 5 A current and 4 ohms resistance what is the voltage
20 V
would a metal spoon or a wooden spoon be a better conductor of electricity
metal spoon