Electricity
quantity of charge on 6,25 Γ 10^18 electrons
may be pos or neg. Pos caused by deficit, neg caused by excess
β E
amount of charge that can be supplied per coulomb of charge
ET = E1 + E2 + E3
produces stronger current - total EMF increases
Et = E1 = E2 = E3
positive and negative connected seperately
less resistance, less internal enerngy lost, last longer
V (potential difference) = W (work done) / Q (charge)
convential flow β positive to negative
current in metal is conducted by negative electrons β negative to positive
based on direction positive charge would take β positive to negative
I (current strength) = Q (charge) / t (time)
in metals atoms are packed close in crystal lattice
outermost electrons can escape to form positive metal ions β free electrons
negative charged electrons are attracted to positive terminal while metal ions remain because crystal lattice
movement effected by collision with positive metallic ions causing resistance
β every electron that leaves a conductor at positive terminal is replaced at the negative terminal
overall charge therefore 0
caused by collisions between electrons and metal atoms that interefere with the flow of charge
1) type of metal
2) length of the conductor
3) thickness (cross sectional area) β thicker = less
4) temperature
R (resistance) = V (voltage) / I (current strength)
for a given resistor (which is normally the same in the circuit) β V directly proportional to I
V (voltage) = I (current strength) x R (resistance)
resistors in series divide PD (voltage)
V = V1 + V2 + V3 β¦
current dividers
i know the formula for this already
more current flows through the resistor with less resistance
ammeter β strength of an electric current (A - amperes) β low resistance and connected in series
voltmeter measures voltage (pd between two points in a circuit) β high resistance, connected in parralel
P (watts - W) = W (work - J) / t (time)
potential difference β the potential difference between two points in a circuit is the energy required to move one coulomb of charge between the points
current β an electric current is the flow of charge (positive to negative) from one point to another in an electrical circuit
current strength β the rate at which charge passes a given point in a conductor
resistance β the ratio of potential difference across the ends of a conductor and current strength
ohms law β current strength is directly proportional to the potential difference between the ends of a given resistor provided that temperature remains constant
power β the rate at which work is done
coulomb β the quantity of charge that passes through a conductor when a current of one ampere flow for one second
quantity of charge on 6,25 Γ 10^18 electrons
may be pos or neg. Pos caused by deficit, neg caused by excess
β E
amount of charge that can be supplied per coulomb of charge
ET = E1 + E2 + E3
produces stronger current - total EMF increases
Et = E1 = E2 = E3
positive and negative connected seperately
less resistance, less internal enerngy lost, last longer
V (potential difference) = W (work done) / Q (charge)
convential flow β positive to negative
current in metal is conducted by negative electrons β negative to positive
based on direction positive charge would take β positive to negative
I (current strength) = Q (charge) / t (time)
in metals atoms are packed close in crystal lattice
outermost electrons can escape to form positive metal ions β free electrons
negative charged electrons are attracted to positive terminal while metal ions remain because crystal lattice
movement effected by collision with positive metallic ions causing resistance
β every electron that leaves a conductor at positive terminal is replaced at the negative terminal
overall charge therefore 0
caused by collisions between electrons and metal atoms that interefere with the flow of charge
1) type of metal
2) length of the conductor
3) thickness (cross sectional area) β thicker = less
4) temperature
R (resistance) = V (voltage) / I (current strength)
for a given resistor (which is normally the same in the circuit) β V directly proportional to I
V (voltage) = I (current strength) x R (resistance)
resistors in series divide PD (voltage)
V = V1 + V2 + V3 β¦
current dividers
i know the formula for this already
more current flows through the resistor with less resistance
ammeter β strength of an electric current (A - amperes) β low resistance and connected in series
voltmeter measures voltage (pd between two points in a circuit) β high resistance, connected in parralel
P (watts - W) = W (work - J) / t (time)
potential difference β the potential difference between two points in a circuit is the energy required to move one coulomb of charge between the points
current β an electric current is the flow of charge (positive to negative) from one point to another in an electrical circuit
current strength β the rate at which charge passes a given point in a conductor
resistance β the ratio of potential difference across the ends of a conductor and current strength
ohms law β current strength is directly proportional to the potential difference between the ends of a given resistor provided that temperature remains constant
power β the rate at which work is done
coulomb β the quantity of charge that passes through a conductor when a current of one ampere flow for one second