physics 3 Flashcards
Define electric current
Electric circuits transfer energy from a power supply to component
Give the equation that links time, charge and electric current
charge=current x time
Define potential difference
the energy given to each charge
Give the equation that links energy, potential difference and charge
energy=voltage x charge
Explain how components in a circuit causes resistance
resistance is caused by collisions between the ions (charged atoms)and the electrons in the wire
Give the equation that relates potential difference, resistance and current
v=I X R
Voltage=current x resistance
What does the IV graph of a resistor look like?
looks line a line going through
What does the IV graph of a filament lamp look like?
it looks like an s
What does the IV graph of a diode look like?
a backwards L
what happens to the resistance of a thermistor as it gets hotter?
the resistance decreases when it is heated up
state one of use of a thermistor?
to stop at a temperature suitable for you like boiler
what happens to the resistance of a light dependent resistor as the light levels increase
the light dependent is a component that changes its resistance in response to light levels
state one use of a light dependent resistor
the LDR can be used to make a reactive circuit that can turn off the on at night using a sensor
state the rules for potential differences in series of circuits
circuits the voltage adds up to
state the rule for current in series of circuits
current is same every where
