Circuits Flashcards
What is an ohmic conductor?
a resistor in which the current is directly proportional to the potential difference at a constant temperature
what is a filament lamp?
a light bulb and as the current through a filament lamp increases so does the temperature
What is a diode?
a component in which the current can only flow one way,and has very high resistance the opposite way that is intended
what is a thermimstor?
A thermistor is a type of resistor whose resistance is strongly dependent on temperature,as the resistor of the thermistor decreases the temperature increases
What is an LDR?
An LDR is a Light Dependant Resistor is a component which is used to detect light levels and the resistance of the component will decrease as light intensity increases
components can be connected in a series or a ____
parallel
What does the power of a device depend on?
the potential difference across it and the current flowing through it.
what will a device with a higher potential difference use more of than a device with lower potential difference?
They will use more energy per second
What is the equation to work out power?
Power = potential differencex current
What is the equation to work out power using letters only?
P = VI
What type of current is supplied by cells and batteries
A direct current
Which current has a potential difference that is either positive or negative
The direct current
Which type of current is used is mains electricity
Alternating current
Which current has a potential difference that is alternating from positive to negative
The alternating current
What is potential difference
the difference in electric potential between two points
