Electricity

quantity of charge on 6,25 × 10^18 electrons

may be pos or neg. Pos caused by deficit, neg caused by excess

→ E

amount of charge that can be supplied per couloumd 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 → positive to negative

current in metal is conducted by negative electrons → negative to positive

based on direction positive charge would take → 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 → 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

→ every electron that leaves a conductor at positive terminal is replaced at the negative terminal

overall charge therefore 0

caused by collisions betweem electrons and metal atoms that interefere with the flow of charge

##### Things that effect it

1) type of metal

2) length of the conductor

3) thickness (cross sectional area) → thicker = less

4) temperature

R (resistance) = V (voltage) / I (current strength)

for a given resistor (which is normally the same in the circuit) → V directly proportional to I

V (voltage) = I (current strength) x R (resistance)

resistors in series divide PD (voltage)

V = V1 + V2 + V3 …

current dividers

i know the formula for this already

more current flows through the resistor with less resistance

ammeter → strength of an electric current (A - amperes) → low resistance and connected in series

voltmeter measures voltage (pd between two points in a circuit) → high resistance, connected in parralel

P (watts - W) = W (work - J) / t (time)

potential difference → the potential difference between two points in a circuit is the energy required to move one coulomb of charge between the points

current → an electric current is the flow of charge (positive to negative) from one point to another in an electrical circuit

current strength → the rate at which charge passes a given point in a conductor

resistance → the ratio of potential difference across the ends of a conductor and current strength

ohms law → current strength is directly proportional to the potential difference between the ends of a given resistor provided that temperature remains constant

power → the rate at which work is done

coulomb → 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 × 10^18 electrons

may be pos or neg. Pos caused by deficit, neg caused by excess

→ E

amount of charge that can be supplied per couloumd 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 → positive to negative

current in metal is conducted by negative electrons → negative to positive

based on direction positive charge would take → 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 → 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

→ every electron that leaves a conductor at positive terminal is replaced at the negative terminal

overall charge therefore 0

caused by collisions betweem electrons and metal atoms that interefere with the flow of charge

##### Things that effect it

1) type of metal

2) length of the conductor

3) thickness (cross sectional area) → thicker = less

4) temperature

R (resistance) = V (voltage) / I (current strength)

for a given resistor (which is normally the same in the circuit) → V directly proportional to I

V (voltage) = I (current strength) x R (resistance)

resistors in series divide PD (voltage)

V = V1 + V2 + V3 …

current dividers

i know the formula for this already

more current flows through the resistor with less resistance

ammeter → strength of an electric current (A - amperes) → low resistance and connected in series

voltmeter measures voltage (pd between two points in a circuit) → high resistance, connected in parralel

P (watts - W) = W (work - J) / t (time)

potential difference → the potential difference between two points in a circuit is the energy required to move one coulomb of charge between the points

current → an electric current is the flow of charge (positive to negative) from one point to another in an electrical circuit

current strength → the rate at which charge passes a given point in a conductor

resistance → the ratio of potential difference across the ends of a conductor and current strength

ohms law → current strength is directly proportional to the potential difference between the ends of a given resistor provided that temperature remains constant

power → the rate at which work is done

coulomb → the quantity of charge that passes through a conductor when a current of one ampere flow for one second