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What is joule's law of heating?
The heat produced due to electric current through a resistance is i) directly proportional to the square of the current ii) directly proportional to the resistance value of the conductor iii) directly proportional to the time of flow of current.
What factors influence resistance to blood flow?
blood volume
Decreased peripheral resistance to blood flow?
Anemia
Is flow in a Venturi tube laminar or turbulent?
In laminar flow, air resistance is proportional to velocity of the body whereas in turbulent flow, air resistance is proportional to (velocity)2.
What is an electrical resistor?
When an electric current moves through a conductor, there is always some electrical resistance to the current. This is because of the attraction of the electrons to the positive nuclei of the atoms in the conductor. This attraction is greater in some conductors than in others, giving them a greater electrical resistance.As the electrons are pushed through a conductor they lose some of their energy as heat. This waste heat can be a nuisance; for example, computers get hot when used. However the waste heat is sometimes useful. For example, because nichrome wire has a fairly high resistance, it is used to make the heating elements in many electrical appliances used around the home. It is usually coiled to take up less space. The filament of a light bulb is made of very thin tungsten wire. When a current is passed through it, the wire becomes so hot that it gives off a brilliant white light.Hope that answers your question!!Thanks for reading :)Thanks GeorgeElectrical resistance exacts a voltage drop as the price for allowing electrical current to flow through the resistance. The use of the term resistance implies that the current flow will be in phase with the voltage across the resistor and that the current flow will be proportional to the voltage drop. These conditions are Ohm's Law. There are devices which do not meet these conditions. They can be useful, but they should be considered as another component class such as thermistors etc. Mathematically V = I x R, where V is the instantaneous voltage across the resistance, I is the instantaneous current through the resistance, and R is a constant specific for the resistance. If V is in Volts and I is in Amperes, then R will be in Ohms. Practical resistors vary modestly with temperature, but change very little with voltage or current, except as these change the temperature. A resistor should be the same for flow in either direction and for DC and AC of modest frequency. At high frequencies resistors can display inductance and/or capacitance.Resistors can be purchased with various resistance tolerances, with various temperature sensitivities, and with various power ratings. Running at full power rating may shorten life and may produce temperatures which affect adjacent components. Derating to 1/2 or even 1/3 power may be wise.It is a measurement of how hard electricity flows thru specific area. In SI is measured in ohm.Resistance is the opposition to the flow of electric current, and is measured in ohms. Resistance is directly proportional to the length of a conductor and inversely proportional to its cross-sectional area, and directly proportional to the resistivity of the material from which the conductor is manufactured. As resistivity is affected by temperature, resistance is indirectly affected by temperature.An example of an electrical resistance is a bar-type radiant heater. The resistance in the windings (these are usually of small diameter wire) causes the electrons to flow slower, causing heat which manifests itself as the hot glow you see and the warmth you feel.
What happens to current flow when the resistance is higher than normal?
For a specific voltage, current flow is inversely proportional to resistance.
What is blood flow directly proportional to?
Peripheral resistance
How does resistance effect the flow of current in a wire?
Current is inversely proportional to the resistance of the circuit. Resistance goes up, current goes down. Resistance goes down, current goes up.
If you wire up a circuit with very thin wire what effect might this have?
less current will flow as resistance is inversely proportional to area
How medullary blood flow inversely proportional to medullary blood flow to?
blood flow inversely proportional to medullary osmolality & degree of concentration of urine. consider case 1, a) blood flow high , causes high H2O reabsorbtion in DLH, less secrn. in ALH., causes H2O accumulation in interstitium, leads to less H2O absorbn in loop of henle. leads to diluted urine. similaely opp. case
How do the partial current behave in relation to the corresponding resistance value for parallel circuiting of resistors?
The ratio of current flow through individual branches of a parallel circuit is inversely proportional to the ratio of resistance of each branch.
What is blood flow resistance?
The resistance of blood flow is what?
Why does urrent flow in a circuit?
current is inversely propotional to resistance.
If the radius of an arteriole increases from 2 to 3 mm how does this affect resistance and blood flow?
Intuitively, it's easy to think of blood flow through the arteries in the same way that you think of the flow of water through pipes. Change the radius of the pipe, and you change how fast water flows to them. Likewise, if you change the radius of an arteriole, you change the rate that blood flows through it. The underlying reason behind these observations is the same. Flow (Q) is determined by a pressure gradient (ΔP) and the resistance to flow (R): Q = ΔP / R If you increase resistance, you decrease flow; likewise, decrease resistance and you increase flow. But what determines resistance? Poiseuille's law tells us that resistance (R) is inversely proportional to the fourth power of radius (r). So let's say we take a normal blood vessel and measure the resistance; let's call that resistance R1. Now if we double the vessel radius, what happens to the resistance? Poiseuille's law (see link to left) tells us that if we double the radius, our resistance goes down by a factor of 16. So R2 is one-sixteenth of R1. How does this affect blood flow? For that we go to our original equation that related flow, pressure gradient, and resistance. From that you can see that flow is inversely proportional to resistance. So if you halve resistance, then you double flow; likewise, if you take our example and reduce resistance to a factor of one-sixteenth, then flow increases by a factor of 16. The same principles and steps can be used to figure out what happens when you change the radius of an arteriole from 2 mm to 3 mm. Only this time you're not increasing radius by a factor of 2; you're increasing it by a factor of 3 / 2, or 1.5.
What can resistance do?
U didn't clearify resistance in what aspect. If u mean electrical resistance,Resistance is phenomenum which describes the limitation of the flow of electric current in an electrical circuit. According to Ohms law (V=IR),the value of resistance is directly proportional to the value of voltage and inversely proportional to the value of current.That is,as the value of resustance increased,voltage also increases;also if the valur of resistance increases,the current reduces(as in I=V/R)
What is the difference between conductor resistance and insulation resistance?
The resistance of a conductor is relatively low while an insulator should have very high resistance. The former is used to transmit electricity and the latter is designed to inhibit flow of electricity.
If you have a thick wire and small electricity what would happen?
the property of a wire to oppose the flow of current is called resistance and resistance is inversely proportional to A (area of cross-section of the wire). so, a small current also should be transferred without much loss.
