Current Flashcards
What is electricity
Electricity is the movement of free electrons in a material toward an area of positive charge
What is the conduction of the electrons determined by
Type of material
What forms of electricity are there
Static, direct DC or alternating AC
What is a cell
A single unit which generates electricity
Generate energy move around circuit
An ec create from CHEMICAL REACTION
Battery
Is two or more electrical cells that are connected together
Conventional Current
Flow of charge From the Positive to negative terminal
What do batteries rely on
Chemical reaction
What does copper work well with
Zinc
Car battery
Lead plates in Sulphuric acid H2SO4
Six 2 volts
Series
Potential difference of 12V
Plates given charge
Generator or alternator
DC
Used light
Problem
Sulphuric acid is corrosive and dangerous
Circuit symbols
What is an ammeter
measure unit of current
Ampere
What is charged measured in
Coulombs
Formula fore current
I=Q/t
Series circuit
Circuit
Where
Current follows a single path
Two or mor
Resistors
One after the other
Current flows through each resistor
Along single path
Parallel circuit
Circuit where current flows through multiple paths
Two or more
Resistors placed in parallel
Both between same point
Current splits
Flows multiple paths
Cells wires resistors were resistors are connected to
For multiple paths
Series-parallel
Current flows combination of paths
When three or more resistors are series connected in some parts and parallel connected in others, it is called a series-parallel combination circuit.
Potential difference
Work must be done on a charge
Is work done done per unit positive charge
Formula for potential difference
V=W/Q
V volts
W joules
Q coulombs
More
• Work (W) is required to push charge in a circuit. • Energy (W) is transferred per unit charge moving between two points in a circuit.
• Voltage is referred to as potential difference since it measures the difference in potential energy between two points in a circuit.
• Potential difference is measured using a voltmeter, which has very high resistance.
• A voltmeter is always connected in parallel with other components in a circuit.
Resistance
Is a material opposition to the flow of electric current
Formula for resistance
R=V/I
R ohms
V volts
I amperes
More resistance
Series
Rtot=R1=R2
Parallel
1/Rt= 1/r1+1/r2
Ohms law
Resistance is the constant of proportionality in the relationship between voltage and current.
Current through a conductor is directly proportional to the potential difference across the conductor, at constant temperature.
Video
https://www.instagram.com/reel/Cw72DuvI65L/?igshid=MzRlODBiNWFlZA== .
