Electricity Flashcards
In which direction does current flow in a circuit
From the positive to negative terminal
in what way do electrons travel around a circuit
Negative to positive (electrons negatively charged)
whats the relationship between current or resistance to temperature
If current or resistance increases, then temperature increases
How are ammeters added to a circuit
In series
how are voltmeters added to a circuit
they are added in parallel to the circuit
How to figure out the potential difference in a series circuit
Vtotal=V1 + V2 + v3
the total potential difference is shared across the circuit
What is the current in a series circuit?
The current is the same anywhere in a series circuit
resistance in a series circuit ?
Total resistance is just the resistance of each component added together
How is a voltmeter connected to a series circuit?
A voltmeter is always connected in parallel to a circuit no matter what kind of circuit it is
what is a parallel circuit ?
a parallel circuit is where the circuit is split into branches
How is potential difference shared in a parallel circuit ?
The potential difference in each component has the same potential difference equal to the battery
For example
If the circuit is powered by a 12V battery, each component will have the potential difference of 12 volts
How is current shared in a parallel circuit ?
The total current in a circuit is shared out between each branch
For example
If the total current is 6Amps and there is 2 branches
the current could be shared out in 3A and 3A
or 1A and 5A
Describe the resistance in a parallel circuit
An increase in components in branches will lead to a decrease in total resistance because more branches leads to an increase in pathways for the current to take
Also
The total resistance is LESS than the resistance of the smallest individual resistor
A step up transformer ?
A step up transformer INCREASES the voltage but decreases the current because an increase in current increases the temperature and an increase in temperature causes energy to be lost
A step down transformer?
DECREASES the voltage to not break appliances and it increases the current to 230V to be used in our homes