Physics :: essays research papers

Electricity has three features that involve authentic, potentiality and defense. Current is the flow of electrons round a circuit that is measured by the ammeter in amps (A). Whilst the potential difference, refer to as potential difference, is the driving force that circulates the menstruation around the circuit that acts like an electric caral pressure. The unit of measurement for this is Volts (V), which is measured by a voltmeter. Resistance is a force that slows down the trustworthy consequently it slows down the flow of current. This is measured in Ohms (W). Between the voltage and resistance at that place is equilibrium, where the voltage impels the current, whereas the resistance is opposing this electrical pressure. The relative sizes of the voltage and resistance decide how big the current will be. increase the voltage allows more current to flow, whilst increasing the resistance would decrease the issue forth of current flowing round the circuit. Discovered by George Ohm in 1826, the current is in direct relative amounts to the potential difference. If the temperature is kept constant as well as other conditions, Ohms law is obeyed. The graph on the cheek illustrates the current by means of a resistor is proportional to the voltage. V=IR gives the formula for Ohms law. In order for current to flow it requires electrons to carry the electric current. The electrons ar the negative charge that can freely move about. indoors metals there are a sea of electrons that can carry the electric current, which is reason why they conduct so well and are utilize for many purposes, such as wires. Factors During the investigation there will be many factors that will affect the resistance in a wire. These factors include Length of wire If the wire space increases, the distance for the electrons to pass through would take a longer period of time since the electrons collide more with atoms of the wire. As a result there is an increase in resistanc e as the number of collisions cause the electrons to flow slowly, which justifies the term for resistance. Conversely if the length of the wire is shortened, the time taken for electrons to travel is reduced given that there are not as many electrons colliding with atoms. As results there are a teensy-weensy number of collisions, hence reduces the resistance. Thickness of wire - A wider breadth of the wire causes atoms within the wire to expand a small distance between each other.