When the iron tip oxidises and burnt flux accumulates on it, solder no longer wets the tip, impeding heat transfer and making soldering difficult or impossible ; tips must be periodically cleaned in use.

When a voltage is applied to the primary winding, a small current flows, driving flux around the magnetic circuit of the core.

When the electric current flowing through such a coil changes it produces a magnetic flux, which is, in simplest terms, a change in the magnetic field over a given area.

When this picture is considered in detail, it is seen that the flux tube must charge up and the surrounding plasma must spin around it.

When the membrane is in thermodynamic equilibrium ( i. e., no net flux of ions ), the membrane potential must be equal to the Nernst potential.

When an emf is generated by a change in magnetic flux according to Faraday's Law, the polarity of the induced emf is such that it produces a current whose magnetic field opposes the change which produces it.

When energy balance is highly negative ( meaning that a woman is starving ) or energy flux is very high ( meaning that a woman is exercising at extreme levels, but still consuming enough calories ), the ovarian cycle stops and females stop menstruating.

When the Time Capsule is programmed with a set of temporal co-ordinates it draws energy from the temporal flux generators and begins to spin slowly at first and then gathering speed, which is followed by two sounds: a saw wave sound gradually increasing in frequency and a looping sequence ( sound that exponentially grows in frequency and then falls low again ) increasing in frequency, too.

When molten, the flux becomes conductive, and provides a current path between the electrode and the work.

When the Hall Probe is held so that the magnetic field lines are passing at right angles through the sensor of the probe, the meter gives a reading of the value of magnetic flux density ( B ).

When the pots are at a white heat they are charged with blister steel broken into lumps of about ½ kg, and a flux to help remove impurities.

When not removed, the flux residue should have smooth, hard surface.

When a magnetic field is applied, however, the microscopic particles ( usually in the 0. 1 – 10 µm range ) align themselves along the lines of magnetic flux, see below.

When the fluid is contained between two poles ( typically of separation 0. 5 – 2 mm in the majority of devices ), the resulting chains of particles restrict the movement of the fluid, perpendicular to the direction of flux, effectively increasing its viscosity.

When Green left Fleetwood Mac in mid-1970, the band were in a state of flux and there was a possibility of not continuing.

When Josiah became king of Judah in about 641 / 640 BC, the international situation was in flux.

When the rotor is in a position that directs the available flux equally in both the in-phase and out-of-phase coils, the output voltages cancel and result in a zero value signal.

When the flux changes — because B changes, or because the wire loop is moved or deformed, or both — Faraday's law of induction says that the wire loop acquires an EMF, defined as the energy available per unit charge that travels once around the wire loop ( the unit of EMF is the volt ).

When the spins are taken to interact in a non-Abelian manner, the model is related to the flux tube model, which is used to discuss confinement in quantum chromodynamics.

When energised, its suppressing coil diverts the magnetic flux from the permanent magnet so that no warning is received on the train.

When taking a curve, a pair of magnetic flux clutches in the rear differential can transfer as much as 100 % of the available rear torque to the outside wheel.

When granulated motifs are desired, small beads are made traditionally by using precious metal wire or fine sheet to start with, which is cut up in small pieces mixed with flux and placed in the small holes of a pitted block of charcoal ( or any other suitable refractory material ) and are then melted with a blowpipe ( or today with a blowtorch ), after which the bits of wire curl up and take a natural spherical like shape to end up in minuscule grains which slightly differ one from the other.

When the momentum flux in the vapor core of the heat pipe is high, there is a possibility that the shear stress exerted on the liquid in the wick can be large enough to entrain droplets into the vapor flow.

When the leading end of the train passes over one of the trackside inductors, the inductor's presence is detected by the onboard equipment through a change in magnetic flux.

When a projectile is thrown by hand, the speed of the projectile is determined by the kinetic energy imparted by the thrower's muscles performing work.

When the bomb reached the design height for this stage ( reportedly 2, 000 meters ) the membrane closed a circuit, activating the circuit between the radar altimeters and the projectile gun.

When the projectile leaves the barrel, this spin lends gyroscopic stability to the projectile and prevents tumbling, in the same way that a properly thrown American football or rugby ball behaves.

When emplaced, the howitzer's high volume of fire compensates in large measure for the lower explosive weight of the projectile compared to the Army's 155mm and 8-inch howitzers.

When a hollow-point hunting bullet strikes a soft target, the pressure created in the pit forces the material ( usually lead ) around the inside edge to expand outwards, increasing the axial diameter of the projectile as it passes through.

When the projectile is swaged into the rifling, it takes on a mirror image of the rifling, as the lands push into the projectile in a process called engraving.

When used in the anti-tank role, a projectile that uses a shaped charge warhead is known by the acronym HEAT ( high explosive anti-tank ).

When a conductive projectile is inserted between the rails ( at the end connected to the power supply ), it completes the circuit.

When fired, however, instead of all the propellant blast following the projectile out the barrel, a large portion is allowed to escape to the rear, gaining a rearward directed momentum which is nearly equal to the forward momentum of the projectile.

When the projectile nears this point the electromagnet is switched off and the next electromagnet can be switched on, progressively accelerating the projectile down successive stages.

When wielded, it can shoot energy blasts from the hand or sword, fire projectile darts, and extrude whip-like grapples to attack or to climb.

When it reaches the base of the tube it hits a firing pin, which detonates the propellant and fires the projectile.

When the round is fired, the projectile is pushed off the spigot, but before the plug clears the spigot it is caught by a constriction at the base of the tube.

When fired the reaction gases ( with a momentum equal to the projectile ) expelled out of the back of the weapon compensate the force exerted on the projectile.

When a gun is fired, it initiates a spherical shock wave but the projectile also generates a conical wave.

When in flight, the main forces acting on the projectile are gravity, drag and if present wind.

When the projectile is fired, the sabot blocks the gas, and carries the projectile down the barrel.