Sketch the direction line of force around a conductor which is carrying current away from the viewer and also towards the viewer.
a dot
The right hand rule. If you were to place your right hand around the conductor, with the thumb pointing in the direction of current flow, your fingers which are wrapped around the conductor will point in the direction of magnetic flux. Said another way, if you are looking at the end of the conductor and current is flowing towards you, then magnetic flux will be counter-clockwise.
Resistance is inversely-proportional to the cross-sectional area of a conductor. When a d.c. current flows, the charge carriers distribute themselves across the whole of the conductor's cross-section. When a.c. current flows, due to something called the 'skin effect', the charge carriers tend to flow towards the surface of the conductor -thus reducing the effective cross-sectional area of the conductor. So, the resistance to a.c. is higher than the resistance to d.c. At mains' frequencies (50/60 Hz), the 'skin effect' is relatively low, but the effect increases significantly with an increase in frequency. So the difference between 'd.c. resistance' and 'a.c. resistance' increases as the frequency increases.
yesAnswerNo! Resistance is determined by the length, cross-sectional area, and resistivity of a conductor. Resistivity is, in turn, affected by temperature -so temperature indirectly affects resistance.These are the only factors that affect resistance. Voltage and current have no direct effect whatsoever on resistance. Current can affect resistance indirectly if it causes the conductor's temperature to increase.For AC circuits, 'skin effect', due to frequency, causes the current to flow towards the surface of a conductor which acts to reduce the effective cross-sectional area of that conductor. So, frequency can also indirectly affect resistance.
An AC current tends to flow towards the surface of a conductor due to a phenomenon called the 'skin effect', which acts to reduce the effective cross-sectional area of that conductor.Since resistance is directly-proportional to the cross-sectional area of a conductor, the conductor's resistance to an AC current is, therefore, higher than its resistance to a DC current (which distributes itself across the full cross-sectional area). We call this elevated value of resistance, AC resistance.The skin effect increases with frequency to such an extent that, at radio frequencies, there is little point in using solid conductors and tubes are used instead. At mains' frequencies (50/60 Hz), however, the skin effect is moderate and, so, the value of a conductor's AC resistance is only slightly elevated compared to its true resistance.It's important not to confuse the term 'AC resistance' with 'reactance', which is a function of a conductor's inductance and/or capacitance, and the frequency of the supply.
with the inductance of a conductor it tends to push current flow to the outsideto reduce the effect you make the conductor hollowwith 80 hz and Cu conductor the current is in the outer 8mm or so.AnswerYou cannot really reduce the skin effect in ordinary conductors; for the sake of economy, you can use tubular conductors. Tubular conductors do not reduce the skin effect, but merely saves copper (if little current flows towards the centre, why have a centre!). However, special, insulated, conductors ('litz' wire) woven or braided in various patterns, can be used for special applications (e.g. high-frequency transformer windings) up to around 1 MHz or so. Because each strand has a very small cross-sectional area, and is insulated from its adjacent conductors, the skin effect is negligible compared with if it were a solid conductor.
The right hand rule. If you were to place your right hand around the conductor, with the thumb pointing in the direction of current flow, your fingers which are wrapped around the conductor will point in the direction of magnetic flux. Said another way, if you are looking at the end of the conductor and current is flowing towards you, then magnetic flux will be counter-clockwise.
The right hand rule. If you were to place your right hand around the conductor, with the thumb pointing in the direction of current flow, your fingers which are wrapped around the conductor will point in the direction of magnetic flux. Said another way, if you are looking at the end of the conductor and current is flowing towards you, then magnetic flux will be counter-clockwise.
We call this Conventional Current Flow, where imaginary positively charged particles are repelled away from a positive charge and attracted towards a negative charge.The reality is that electrons are actually flowing through the conductor. Electrons are negatively charged particles and flow from negative to positive. It's just easier to think of a positive current flowing than a negative current.
because current flows in the opposite direction of the flow of electron.since electrons are negatively charged particle they moves towards the positive and hence current flows in the opposite direction to the flow of electrons (that is from positive to negative)
As we know that in normal current flow, electrons passage is always from the negative to positive side , now in the case of earth it acts as a ground to the positive charge, and current flows from positive charge to the earth, which acts as a anode and as we know a passage of current occurs only if there is negatively charge electron flowing towards positively charged cathodes. So electrons may flow from earth neutralizing the positive charge.
An affluxion is an act of flowing towards something.
Veins have valves which stop the blood from flowing backwards
Electricity tends to travel towards the ground. when we touch an electrical substance, our body acts as a conductor and the current passes through our body to the ground. this is how we get an electric shock.
Ebbing is when water moves away from the land. Flowing is when water moves towards the land. J
If we imagine a man is swimming along the wire in the direction of current with his face always turned towards the needle ,so that the current enters trough his feet and leaves at his head, then the north pole of magnetic needle will be deflected towards his left hand .this rule can be recollected with the help of the word snow.. snow - current flowing from south to north over magnetic field then deflection of compass or needle is towards west..
Towards you.
There are no large rivers flowing into England from either Scotland or Wales, the only two places that could have a river flowing "towards" England.