Table of Contents
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 the 3 things resistance depends 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.
What are the factors that affecting the resistance?
There are 4 different factors which affect resistance: The type of material of which the resistor is made. The length of the resistor. The thickness of the resistor. The temperature of the conductor.
What are the factors affecting the resistance of an electrical conductor?
Factors on which conductor depends The temperature of the conductor. The cross-sectional area of the conductor. Length of the conductor. Nature of the material of the conductor.
Will current flow more easily through a thick?
The current will flow more easily through the thick wire than the thin wire. It is because the resistance of a conductor is inversely proportional to its area of cross-section. If the thicker the wire, the less is resistance and hence more easily the current flows.
Which has more resistance copper or steel?
The higher the % IACS, the more conductive the material is. This standard refers to a pure, “standard” copper having a resistivity of 1.7241 microhm-cm at 20°C (68°F).Electrical Conductivity of Materials. Material IACS % Conductivity Nickel Aluminum Bronze 7 Steel 3 to 15.
Which is directly proportional to the resistance?
The resistance of a wire is directly proportional to its length and inversely proportional to its cross-sectional area. Resistance also depends on the material of the conductor. The resistance of a conductor, or circuit element, generally increases with increasing temperature.
What is the relationship between resistance and current?
Ohm’s law defines the relationship between the voltage, current, and resistance in an electric circuit: i = v/r. The current is directly proportional to the voltage and inversely proportional to the resistance.
How do I calculate resistance?
If you know the total current and the voltage across the whole circuit, you can find the total resistance using Ohm’s Law: R = V / I. For example, a parallel circuit has a voltage of 9 volts and total current of 3 amps. The total resistance RT = 9 volts / 3 amps = 3 Ω.
What is the most electrically resistant material?
Silver has the highest electrical conductivity of all metals. In fact, silver defines conductivity – all other metals are compared against it. On a scale of 0 to 100, silver ranks 100, with copper at 97 and gold at 76.
Does the length of wire affect resistance?
The resistance of a long wire is greater than the resistance of a short wire because electrons collide with more ions as they pass through. The relationship between resistance and wire length is proportional .
What material has the highest resistance to electricity?
The material that has the highest electrical resistance is silver. After silver copper and gold are the materials that have the highest electrical resistance.
Does current affect resistance?
Current is inversely proportional to the resistance.
What happens to current if resistance increases?
As the resistance increases, the current decreases, provided all other factors are kept constant. Materials with low resistance, metals for example, are called electrical conductors and allow electricity to flow easily.
Does voltage increase with resistance?
In other words, the current is directly proportional to the voltage and inversely proportional to the resistance. So, an increase in the voltage will increase the current as long as the resistance is held constant. If the current is held constant, an increase in voltage will result in an increase in resistance.
Which has more resistance carbon or copper?
The fundamental resistances of small copper nanowires (∼60 nm diameter) are found to be larger than those predicted by Ohm’s law. We find that the resistance of carbon nanotube bundles is smaller than that of the copper wires for dimensions below 60 nm.
Which metal is best conductor?
What Metal is the Best Conductor of Electricity? Silver. The best conductor of electricity is pure silver, but to no surprise, it is not one of the most commonly used metals to conduct electricity. Copper. One of the most commonly used metals to conduct electricity is copper. Aluminum.
What is the resistance of steel?
Resistivity of some common materials Material Resistivity (OHM-CMIL/FT) Resistivity (10−6 OHM-CM) Nickel 41.69 6.93 Platinum 63.16 10.5 Stainless Steel (304) 541 90 Steel (.5% carbon) 100 16.62.
What material has lowest electrical resistance?
Pure silver is the best conductor of electricity, then copper, and then aluminum. Silver is the best conductor because it has the least resistance to the flow of electricity.
What is the lowest resistance metal?
Element silver has lowest resistivity and hence has higher conductivity. Resistivity – Resistivity is equal to the resistance of a given conductor having a unit volume.
What is the resistance of mercury?
Resistivity and Temperature Coefficient at 20 C Material Resistivity ρ (ohm m) Ref Platinum 10.6 1 Manganin 48.2 1 Lead 22 1 Mercury 98 1.
Which changes would cause an increase in the resistance?
Answer: Resistance can increase relative to Temperature, Nature of Material, Length of Conductor or wire.,and Cross-section area.
What happened to current as resistance decreases?
The current is directly proportional to the voltage and inversely proportional to the resistance. This means that increasing the voltage will cause the current to increase, while increasing the resistance will cause the current to decrease.
What happens to current as resistance decreases?
the current in a given circuit is inversely proportional to the resistance in the circuit, which means that the current will decrease if the resistance is increased.
Which action would increase the resistance of a copper wire?
Increasing the length of the wire will increase the resistance of the wire.
Does copper have high resistance?
Copper has a lower resistivity and is a better conductor of electricity than iron. Copper is a better conductor than iron, which means current can flow easier (with less resistance) through copper. This is an inherent property of a material.
Which following has highest resistivity?
Which of the following has highest resistivity? Mica. Paraffin. Air. Mineral oil.
Does steel have a low resistance?
The resistivity of steel is on the order of 10−7 Ωm.
Does resistivity depend on temperature?
Resistivity depends on the temperature of the material. In metal conductors, when the temperature increases, the ion cores in the metal vibrate with a larger amplitude. This hinders the flow of electrons, and the resistivity increases.
What is the difference between resistance and resistivity?
Resistance is defined as the property of the conductor which opposes the flow of electric current. Resistivity is defined as the resistance offered by the material per unit length for unit cross-section. The SI unit of resistivity is Ohm.
