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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 that affect resistance?
There are several factors that affect the resistance of a conductor; 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.
Does temperature affect resistance?
Heating a metal conductor makes it more difficult for electricity to flow through it. These collisions cause resistance and generate heat. Heating the metal conductor causes atoms to vibrate more, which in turn makes it more difficult for the electrons to flow, increasing resistance.
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 two factors that influence resistance?
Resistance is the property of the material that restricts the flow of electrons. There are four factors affecting resistance which are Temperature, Length of wire, Area of the cross-section of the wire, and nature of the material.
What are five 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 Mar 6, 2018.
Is resistance directly proportional to temperature?
The resistance increases as the temperature of a metallic conductor increase, so the resistance is directly proportional to the temperature.
What is the relationship between resistance and temperature?
As temperature rises, the number of phonons increases and with it the likelihood that the electrons and phonons will collide. Thus when temperature goes up, resistance goes up. For some materials, resistivity is a linear function of temperature. The resistivity of a conductor increases with temperature.
Is heat directly proportional to resistance?
Heat produced is directly proportional to the resistance of material through which the current flows.
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.
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.
What are the two factors that influence resistance the two factors are Brainly?
Resistance :- Length of the Conductor ( R directly proportional to length) Area of cross- section of the conductor ( R inversely proportional to Area of Cross section of the conductor) Nature of material of the Conductor. Temperature ( With temperature resistance increses).
What can cause high resistance in a circuit?
If abnormally high, one possible cause (among many) could be damaged conductors due to burning or corrosion. All conductors give off some degree of heat, so overheating is an issue often associated with resistance.
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.
What 2 things affect deep currents?
Deep ocean currents are density-driven and differ from surface currents in scale, speed, and energy. Water density is affected by the temperature, salinity (saltiness), and depth of the water. The colder and saltier the ocean water, the denser it is.
What affects current flow?
Current is due to the flow of electrons. Resistance opposes current and therefore the higher the resistance, the smaller the current. Therefore the factors that affect the resistance are the same factors that control the flow of current through a wire.
What causes a current?
The colder and saltier the water is, the denser and heavier it is. Cold, dense water tends to sink and flow under warmer, lighter water, creating a current.
Why resistance is directly proportional to length?
As the length increases, the number of collisions by the moving free electrons with the fixed positive ions increases as more number of fixed positive ions are present in an increased length of the conductor. As a result, resistance increases.
Why is temperature directly proportional to resistance?
Resistance of a conductor is directly proportional to temperature. Reason : With the increase in temperature, vibrational motion of the atoms of conductor increases. Due to increase in vibration, probability of collision between atoms and electrons increases.
Is resistivity directly proportional to resistance?
Resistivity ρ is an intrinsic property of a material and directly proportional to the total resistance R, an extrinsic quantity that depends on the length and cross-sectional area of a resistor.
Does resistivity depend on length?
The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size.
Why does resistivity decrease with temperature?
When the temperature in increased the forbidden gap between the two bands becomes very less and the electrons move from the valence band to the conduction band. Thus when the temperature is increased in a semiconductor, the density of the charge carriers also increases and the resistivity decreases.
When resistance and time is constant heat is directly proportional to?
(i) Heat produced in the circuit is directly proprotional to the resistance if a constant current is flowing through a circuit, because H=I2RtorH∝R. It is so in series combination of resistors.
Does higher resistance mean more heat?
A higher resistance produces more heat. The time, t for which current flows. The longer the time the larger the amount of heat produced. the higher the current the larger the amount of heat generated.
