- If you increase the number of lamps in a series circuit , there will be less current. ...
- You could increase or decrease the resistance in a circuit by using a variable resistor .
- The quantities voltage, current and resistance are linked by the relationship :
- This relationship is called Ohm’s Law.
How can you reduce the resistance of a resistor?
Sometimes you need a resistor with a value you don’t have in your kit. Instead of ordering and wanting for a resistor with a value you need you can change the resistance of a resistor by using another resistor or many. By installing resistors in a parallel or series circuit you can change the value in Ohms.
What are four ways in which you can decrease resistance in a circuit?
Changing the material, increasing the cross section area, lowering the temperature, and using a thicker wire are some of the ways to reduce resistance.
What are 2 ways to decrease electrical resistance?
Of course there exist many different ways to reduce the resistance, such as using a thicker wire (increase the cross section area), lowering the temperature , or even changing the material.
What causes resistance to decrease in a circuit?
Voltage is the force that causes current to flow in a circuit. ... In other words, for a given voltage, the current in the circuit will decrease as the resistance increases.
What are the factors that affect resistance?
- material, eg copper, has lower resistance than steel.
- length – longer wires have greater resistance.
- thickness – smaller diameter wires have greater resistance.
- temperature – heating a wire increases its resistance.
What causes resistance?
An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance.
What is the method to decrease the resistance of a copper wire?
Changing the material, increasing the cross section area, lowering the temperature , and using a thicker wire are some of the ways to reduce resistance.
What four things does the resistance of a wire depend on?
The resistance of a conductor depends on the cross sectional area of the conductor, the length of the conductor, and its resistivity . It is important to note that electrical conductivity and resistivity are inversely proportional, meaning that the more conductive something is the less resistive it is.
Does diameter affect resistance?
The greater the diameter of the cylinder, the more current it can carry (again similar to the flow of fluid through a pipe). In fact, R is inversely proportional to the cylinder’s cross-sectional area A . ... The larger its cross-sectional area A, the smaller its resistance.
What is the relation between current and resistance?
The relationship between current, voltage and resistance is expressed by Ohm’s Law. This states that the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit , provided the temperature remains constant.
What is resistance in a circuit?
Resistance is a measure of the opposition to current flow in an electrical circuit . Resistance is measured in ohms, symbolized by the Greek letter omega (Ω). ... Conductors: Materials that offer very little resistance where electrons can move easily.
Are resistance and current directly proportional?
The relationship between current, voltage and resistance is expressed by Ohm’s Law. ... This states that the current flowing in a circuit is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit, provided the temperature remains constant.
What are the 3 factors that affect resistance?
How much resistance a material has depends on several factors: the type of material, its width, its length, and its temperature . All materials have some resistance, but certain materials resist the flow of electric current more or less than other materials do.
What are 5 factors that affect current flow?
There are four factors affecting the origin and flow of Ocean Currents i.e. Rotation and gravitational force of the Earth; Oceanic factors (temperature, salinity, density, pressure gradient and melting of ice); atmospheric factors (atmospheric pressure, winds, rainfall, evaporation and insolation); factors that ...
What factor does not affect resistance?
So it depends on the material. It is inversely proportional to the cross-sectional area of the wire. The r esistance is directly proportional to the length of the wire and resistivity of the material used in making the wire.
