P3 Flashcards
like charges…
repel
opposite charges
attract
electric charges have what kind of field
an electric field
electric fields cause what force?
an electrostatic force
what 3 ways test whether an object has a static charge
see if it will pick up bits of paper
see whether it will change the direction of water flow
and a gold leaf electroscope
charge=
current x time
what does a variable resistor look like
a horizontal rectangle with an arrow through it
a standard test circuit for an IV graph consists of…
a cell
an ammeter
a variable resistor
a voltmeter
the component you’re testing
wires
Resistors and wires have what shape IV graph
constantly increasing (straight)
filament lamps have what shape IV graph
an ‘f’ shape, it’s curvy
diodes have what shape IV graph
a graph thats only in the positive, as soon as it goes negative, it has infinite resistance as diodes can only go one way, in the positive, as current increases, potential difference also rapidly increases.
what does resistance do when temperature increases
increases
a thermistor is a…
temperature dependent resistor
