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julia7c
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Last updated: April 22, 2025
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First submitted
April 22, 2025
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Hint
Answer
measure of current that flowed within a period of time
charge
what is the unit for charge
coulombs
what is the formula linking charge, current and time
Q=It
what is the charge of an electron
-1.6x10^-19 C
how can we find the number of electrons that have flown past a point
identify the charge
use number of electrons=charge/charge of an electron
does conventional current flow from positive to negative or negative to positive
positive to negative
how does electron flow differ to conventional current
electron flow is negative to positive
what is Kirchoff's first law
total current flowing into a junction=total current flowing out of a junction
what is meant by potential difference
work done per unit charge
what formula links energy, power and time
E=Pt
which formula links charge, energy and voltage
V=E/Q
how does the temperature affect the resistance of wires and resistance
increasing temperature increases the resistance
why does increasing the temperature of a wire increase its resistance
the particles in the wire vibrate faster, slowing the flow of electrons, increasing the resistance
the current through a conductor is directly proportional to the potential difference and inversely proportional to the resistance
Ohm's law
what does a diode do
only allows current to flow one way in a circuit
what factors affect the resistance of a wire at constant temperature
length
cross-sectional area
resisitivity
how does resistivity of a metal vary with temperature
as temperature increases the resistivity of a metal increases
Hint
Answer
what is the resistivity of a superconductor below the critical temperature
zero
what happens to the resistance of a wire as the length is increased
it increases
what happens to the resistance of a wire as the cross-sectional area is increased but all other factors are kept the same
it decreases
the average velocity of charge carriers moving through a material due to an electric field
mean drift velocity
do conductors or insulators have the highest number of charge carriers
conductors
do semiconductors or insulators have the highest amount of charge carriers
semiconductors
give an example of a material with a high number of charge carriers
metals/graphene
give the number of charge carriers for the perfect insulator
zero
a circuit that has two or more resistors in series with a power supply
potential divider
a potential divider has two resistors in series. If the output voltage is half the supply voltage, the resistors must be
identical
what are some uses of a variable divider
volume control for a loud speaker
brightness control for a dimmer switch
variable power supply
what is the energy supplied by a power supply per coulomb of charge
electromotive force
what is a power supplies internal resistance
the resistance of the power supply itself
the voltage measured across the terminals of a source
terminal potential
what is meant by the difference between the electromotive force of a power supply and the terminal potential
lost volts
what happens to the resistance of an LDR when placed in bright light
it decreases
how can the resistance of a thermistor be increased
cool the thermistor
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