Physics E Flashcards
Static electricity
Cause pf when electrons are transferred from one insulator to another by friction
Static charges
If an object gains electrons it becomes negatively charged
If an object loses electrons it becomes positively charged
Electric charge
Thunder with an electrical charge experience a force when placed in an electrical force
Flow of charge
In a closed circuit electrical charge moves form a high potential difference to a low potential difference
Electrical current
The flow of electrical charge
Q= current / time
Voltage
The difference in electrical potential
V=IR
Work
Voltage is work done per unit of charge
E = voltage x charge flow
Resistance
Measures how hard it is for electrical current to pass though a component
Factors effecting resistance
- as length increases so does resistance
- as temp increases so does resistance
- material of component effects resistance
Ohms law
Voltage across a conductor is directly proportional to the current flowing through it provided all physical conditions remain constant
Ohms law ( equation)
Voltage = current. X Resistance
Current and voltage in series circuit
Current is the same at all point
Voltage is shared across all components
Current and voltage in parallel circuit
Current is shared across each component
Voltage is the same at all points
National grid
Supplies electricity from power stations to customers at high voltage to reduce energy loss
DC
Direct current- electricity flows in a single direction
