Investigating Resistance in a Circuit
Prediction
Resistance makes it harder for the current to flow in a circuit.
Resistance occurs when the free electrons collide with the atoms. The
greater the resistance is, the smaller the current will be. Resistance
is measured in ohms (Ω). To work out the resistance of any given
voltage, we must use Ohm's Law. Ohm's Law states that the current
through a metallic conductor, like a wire, is proportional to the
potential difference (Voltage), when at a constant temperature. The
equation is this:
Electrical current only flows if there are charges that can move
freely. Metals contain mobile electrons that can flow through the
metal. This is why electric current flows well in metals. Current in a
circuit flows from positive to negative.
If the voltage is increased more current will flow. Voltage is the
electrical pressure that pushes the current around the circuit. It is
measured in volts. The total voltage supplied is shared between the
various components.
Resistance is anything that slows the flow of electrons (current) down
in a circuit. Resistance is measured in ohms, W. As resistance is
increased less current will flow. The total resistance in a series
circuit is sum of all the resistances
Ohm's law is the mathematical relationship between the voltage,
current and resistance in an electric circuit. This law states:
Voltage (V) = amps (I) x Ohms (R)
V=IR
The relationship between heat and resistance is demonstrated by the
fixed resistor and filament light bulb experiments. When a filament
light bulb is used more heat is created than when a fixed resistor was
used. Therefore the filament light bulb graph has a curve, while the
fixed resistor graph produces a straight line. In these graphs
resistance is the gradient or voltage (v)/ current (I).
In a series circuit all the components are connected in a line between
the positive and negative terminals. The voltmeter is the only
exception as it is always connected in parallel. If one part of the
An electrode is a component of an electric circuit that connects the conventional wiring of the circuit to a conducting medium such as an electrolyte or a gas. The electrically positive electrode is called the anode and the negative electrode the cathode. If an anode and a cathode are placed in a solution of an electrolyte and a source of direct current is connected between them, the positive ions in the
Then we will remove the cell and connect point A to point B, at the
When a positive and a negative electrode are placed in a solution containing ions, and an electric potential is applied to the electrodes, the positively charged ions move towards the negative electrode, and the negatively charged ions to the positive electrode. As a result, an electric current flows between the electrodes. The strength of the current depends on the electric potential between the electrodes and the concentration of ions in the solution. Ionization is the formation of electrically charges atoms or molecules.
From this I can tell I can use 3 volts and resistance wire that is
equation V = IR. V - volts, I - current and R - resistance. I plotted
I also decided to use a wooden block to keep hold of the wire, because
It is also relevant to know of Ohm’s Law, which states that the current through a metallic conductor (e.g. wire) at a constant temperature is proportional to the potential difference (voltage). Therefore V ¸ I is constant. This means that the resistance of a metallic conductor is constant providing that the temperature also remains constant. Furthermore, the resistance of a metal increases as its temperature increases. This is because at higher temperatures, the particles of the conductor are moving around more quickly, thus increasing the likelihood of collisions with the free electrons.
The electrolyte (solution) contains negative and positive ions. For electrolysis to work there must be the same amount of positive ions to negative ions so that the solution is electrically balanced. A solution of metal compounds can only conduct electricity if it is balanced. The negative ions are attracted to the anode (+ve electrode) and the positive ions (protons) are attracted to the cathode (-ve electrode). The electrolyte effect the amount of atoms attracted.
longer it will take electrons to get to the end of the wire. This is
do this I will need to make sure that I am using the milliamp/volt or
In order to decide upon the voltage and lengths of wire to use in the
V(voltage) I (current) Therefore, I = V R Therefore, if V is constant, in order to increase I, R must decrease.
There are formulas to calculate electrical conductivity and resistivity. Conductivity is defined as the inverse of resistivity (a high conductivity means a low resistance), I=V/R or current equals voltage over resistance. This is known as Ohm’s Law. Electrical resistance is calculated by the formula, R=V/I or resistance equals voltage over current. Ohm’s law however does not hold true if temperature changes. Materials that obey Ohm’s law are known as ohmic or linear because the potential difference across it varies linearly with the current. In addition, whether or not a material obeys Ohm’s law its resistance can be described in bulk resistivity. Furthermore, over sizable ranges of temperature, this temperature depe...
An electric current is flow of electric charge in electric circuits this charge is frequently carried by simply moving electrons inside a wire. It can be carried by simply ions with in the electrolyte, or by simply both ions and electrons like plasma. Ohm’s law states the current all through a conductor among two points directly relation to the optional differences across two points. Introducing this constant of proportionality, the resistance one get to the usual mathematical situation that identifies the relation: V=IR.
The total resistance of the resistors in series is greater than the individual resistances while on the other hand; the total resistance of a parallel group is always less than the individual resistances.