current, potential difference and resistance Flashcards
(18 cards)
what does a thermistor look like
hockey stick going through it
what is current defined as
the rate of flow of charge
what is voltage defined as
energy transferred per unit of charge
the current in a metalic conductor is a flow ofโฆ
negatively charged electrons
what unit is time in in Q = It
seconds
formula linking energy, charge and voltage
E = QV
State the equation linking energy, voltage, current and time
E = IVt
why does the temp reach a steady value in practical
the rate of energy loss is equal to the rate of energy supplied
advantages of series circuit
- fewer wires
- lower resistance values
disadvantages of a series circuit
if one component fails, the whole circuit fails
no control of individual variables
formula linking energy charge and voltage
E = QV
what is meant by the term electric current
rate of flow of charge
what does 1 volt tell us
1 joule of energy is transferred for each coulomb of charge moving through the circuit
Define power
Amount of energy transferred per unit of time
define voltage
energy transferred per unit of charge between two points
what is 1 volt the equivalent to
1 joule of energy by one coulomb of charge
define resistance
the opposition of a component to the flow of electric current through it
what is the relationship between resistance and current
as resistance increases, current decreases
