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Yes, different metals resist the flow of electric current by different amounts. This property of the material is called its resistivity, and is measured in ohm-metres (Ω m).
You can measure the resistivity by taking a wire of length L and cross-sectional area A, and measuring the resistance along it. You can measure the resistance by measuring the current and the voltage along the wire. If you apply a voltage V (in volts, V) along the length of the wire, and measure the resulting current as I (in amps, A), then the resistance R (in ohms, Ω) is given by:
R = I / V
The resistivity of the material (in ohm-metres) is given by:
ρ = R A / L
= resistance (ohms) x cross-sectional area of wire (square metres) / length of wire (metres)
Typical values for the resistivity at 20 degrees Celsius range from the order of 10-8 Ω m (for conductors such as copper or silver) to 1013 Ω m (for insulators such as hard rubber), or even higher.
Wiki User
∙ 11y ago
Wiki User
∙ 11y agoIn metal, we know charge carriers are free electron.so,when external potential difference is applied to metal,then electron gets accelerated,but the particles(ion) from which the metal is made starts opposes the flow of electron.
Because collision are the basic cause of resistance.when the electron gets accelerated that means the electron start moving which means the electron have some kinetic energy so, when the electron collide with the particle(or ion) then the energy is transferred. the electron loses some of the energy and result the electron is slow down.This leads to resistance.this transferred energy causes the resistors to heat up.
FOR EXAMPLE- IF YOU TOUCH YOUR CELLPHONE'S CHARGER DURING CHARGING, YOU FEEL WARM BECAUSE WHEN THE ELECTRON COLLIDE WITH THOSE ION FROM WHICH MATERIAL IS MADE,THEN THE ENERGY IS TRANSFERRED, THIS TRANSFERRED ENERGY CAUSES THE RESISTORS TO HEAT UP.
Wiki User
∙ 11y agoMetals are generally good electrical conductors, not good electrical resistors.
Wiki User
∙ 10y agoWhy are none metal have more electrical resistance
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Why does nichrome get hot?
Nichrome has a high electrical resistivity.
What is the opposition to the flow of electrons is called?
Resistance, or electrical resistanceResistance, or electrical resistanceResistance, or electrical resistanceResistance, or electrical resistance
Why can transition metals be used to make electrical wires?
Their high conductivity is why transition metals are used to make electrical wires.
Why do you call metals as poor conductors?
Metals are poor conductors as they offer resistance to the flow of electrons however super conductors offer less or no resistance
Does sugar create electrical resistance?
Sugar is not used in electrical circuits.
What are cold resistance and hot resistance?
Metals heat up as electrical currents flow through them. Cold resistance is the metals resistance before it is operating. Hot resistance is the metals resistance after operating time has elapsed some.
Why does nichrome get hot?
Nichrome has a high electrical resistivity.
Does thickness of a metal affect its electrical resistance?
Metals are conductive, but are not perfect conductors and so they have some electrical resistance. How the resistance of the metal is affected by "thickness" depends on what you mean by thickness. If the electrical current has to flow through a longer piece of metal, then the resistance of the metal to electrical flow would be greater. However, if you take that same length of metal and increase the area of the metal by increasing its "thickness", then the resistance of the metal becomes less.
What type of material allows a charge to move freely through it?
A material through which an electric current flows easily is called an electrical conductor. Many metals, especially silver and copper, are excellent electrical conductors.
What do you mean by 'cold resistance' and 'hot resistance'?
Metals that make up typical resistors (and many other electrical components for that matter) tend to heat up as current flows through them. "COLD" resistance is the resistance before it is operating and "HOT" resistance is the resistance after some operating time has elapsed.
What measures electrical resistance?
an ohm meter OR multimeter is used to measure the electrical resistance...
How does the electrical and heat conduction of metals and non metals compare?
Electrical and heat conduction is much greater in metals than in non metals.
What is the opposition to the flow of electrons is called?
Resistance, or electrical resistanceResistance, or electrical resistanceResistance, or electrical resistanceResistance, or electrical resistance
What is principle of thermistor?
The thermistors are resistors whose resistance changes with the temperature. While for most of the metals the resistance increases with temperature, the thermistors respond negatively to the temperature and their resistance decreases with the increase in temperature. Since the resistance of thermistors is dependent on the temperature, they can be connected in the electrical circuit to measure the temperature of the body.
Who when and how was electrical resistance discovered?
electrical resistance was discovered by Georg Ohm in the late 1820's.
What is resistance expressed in?
Electrical resistance is measured in Ohms.
What factor should change in electrical conductivity of metals and non metals?
Electrical conductivity depends on temperature.
