Electricity Flashcards
cell
is a source of electrical potential energy
cell definition
converts chemical potential energy to electrical potential energy
work is done…
whenever energy is transferred, whenever energy is transferred work is done
1 Volt
1 Joule
1 Coulomb
current
the rate of flow or charge
resistance/ electrical resistance
the opposition to the flow of charge that a conductor offers
factors that effect resistance
- length of wire
- thickness of wire
- temperature of wire
- type of material
length of wire
longer the wire the more resistance
thickness
the thicker the wire the less resistance
temperature
higher the temperature the more resistance
type of material
depends on the number of delocalised electrons
delocalised electrons
free electrons, allow the ability for electricity to flow
conventional current
the flow of positive charge from positive terminals to negative terminals
electron current
the flow of negative charge from negative terminals to positive terminals
Ohms law
R = V/I
series
- only one path for the current to flow
the more resistors in series
the bigger the total resistance
voltage
energy transferred per unit charge
give a rule for current in series
current is the same at all points in a series circuit (except voltmeter)
EMF
The total energy that the cell/battery is able to give to the coulomb of charge
parallel circuits
- current splits
- Voltage is the same across all parallel resistors
resisters in parallel
the more resistors you put in the less resistance you have
