- 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 properties of a wire affect its 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. See resistivity. The resistance of a conductor, or circuit element, generally increases with increasing temperature.
What causes resistance in a wire?
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 are the four ways to lower resistance in a 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 will increase the resistance of a wire?
Decreasing the resistivity of the material the wire is composed of
will increase the resistance of the wire. 2. Increasing the length of the wire will increase the resistance of the wire. … Decreasing the cross-sectional area of the wire will increase the resistance of the wire.
Which change decreases the resistance of a piece of copper wire?
Resistance decreases as copper (or any other metal)
is cooled
. Its atoms vibrate less, and so they impede the flow of electrons less. Pure copper has less resistance than copper containing impurities. Impurity atoms are a different size to copper atoms, so they get in the way of moving electrons.
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 does the resistance of a wire depend on its length?
Resistance is
directly proportional to the length of the conductor
. So, as the length increases, the magnitude of resistance increases. … Resistance is inversely proportional to the cross-sectional area of the conductor. Thus, the resistance of the conductor decreased with the decrease in cross-sectional area.
Does voltage affect resistance?
Ohm’s law states that the electrical current (I) flowing in an circuit is proportional to the voltage (V) and
inversely proportional to the resistance (R)
. Therefore, if the voltage is increased, the current will increase provided the resistance of the circuit does not change.
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.
Does temperature affect the resistance of a wire?
Heating a metal conductor makes it more difficult for electricity to flow through it. … Heating the metal conductor causes atoms to vibrate more, which in turn makes it more difficult for the electrons to flow,
increasing resistance
.
Which copper wire would have the smallest resistance?
Case 2
has the smallest resistance because it has the smallest length and the largest area.
What are the factors affecting the 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 would increase the resistance of a metal wire?
Resistance
increases with the temperature of the wire
.
This makes it difficult for the electrons to move without interaction with an atom and increases resistance. The relationship between resistance and temperature is not a simple one.
Which of the following does not change the resistance of a wire?
where – electrical resistivity (depend on material) – cross-section area of the wire (depend on diameter) – length of wire. The only item not listed here is
voltage
. Voltage value is not affect resistance (if we will not take into account any temperature changes).
Which change increases the resistance of a piece of copper wire?
Since the resistance of some conductor, such as a piece of wire, depends on collisions within the wire itself, the resistance depends on temperature. With
increasing temperature
, the resistance of the wire increases as collisions within the wire increase and “slow” the flow of current.
