Electricity Flashcards
Electrical current
Electric charge transferred per unit
Direct current
Charges flow in one direction
Even though charges travel in one direction it doesn’t mean it has a constant voltage
Alternating current
Charges move top and fro
What do charged particles experience in an electric feild
Force
Potential difference
Measure of the energy given to the charge carrier in a circuit
Ohms law experiment
Connect an ammeter, voltmeter and a variable voltage supply together using connecting leads
Increase the voltage and see what happens to current
Plot a graph and determine resistance
Transister
Electric switch in a curcuit
Electrical power
Amount of energy transformed per unit time
Reistance
measure of how hard it is for charges to flow through a component or wire.
What fuse should be used for appliances over 720 W
13A
What fuse should be used for appliances under 720 W
3A
Conducter
Material in which charges can move eg iron
Insulater
Material where charge carriers can move through eg glass
Potential difference
The work done in moving 1c of charge from one point to another
Series curcuit
One complete path of conductors
Current same at all points
Sum of components = voltage of supply
When another resister is added resistance increases
Parallel curcuits
More than one path for conductors
Sum of current in parallel branches = voltage of supply
When another resister is added resistance decreases
Wher does an ammeter go in a curcuit
Before the resistor
Where does voltage go in a curcuit
Above the resister
Where does an ohmmeter go in a curcuit
Takes place of cell
Why can water conduct
Water is eltrically neutral
Contains both positive and negative ions
Cell
Source of electrical energy
Variable resistor
Increases and decreases current
What happens to neutrons in an electric field
Neutron does not experience an electrical force in an electric feild
Why does the ohms law graph start at the Origen
When switch is open reading on metre is 0
