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A horseshoe magnet is moved back and forth across a piece of copper wire an electric current is detectable in the wire?
Wiki User
∙ 13y ago
yes, it will be very small but the inductance from the magnet should stimulate a current in the wire as it will cause electrons to move.
Wiki User
∙ 13y ago
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Why electric current across a wire drops?
Electric current does not drop. Electric voltage, however, drops across a wire because the wire has non-zero resistance. (Do not confuse electric current with electric voltage - they are not the same.)The reason current does not drop is that, in a series circuit, according to Kirchoff's current law, the current at every point in a series circuit is the same.
How much electric current can cause death?
6 MilliAmps across the heart.
How does an electric generator generate an electric current The generator?
The rotor turns (rotates) causing magnetic fields to move across a coil of wire. This induces an electrical current in the wires of the coil.
Is electric current and current the same thing?
Not really. You can compare them with the analogy of water flowing through a pipe. For water to flow, there must be a pressure difference across the ends of the pipe. An electric current is a movement of electric charges along a conductor. For those charges to move, there must be a voltage (more accurately, a 'potential difference') across the ends of the conductor. So a potential difference is required to cause current to flow.
What happens with electric current when applying the same voltage the resistance of the circuit is reduced?
As the resistance is reduced across the same voltage, the current increases.
What is the unit used to measure electric flow?
The SI unit for measuring an electric current is the ampere, which is the flow of electric charge across a surface at the rate of one coulombper second.
Why there is no current in a metal in the absence of electric field across it?
free electron hav random motion in all posible
Is the potential difference across an electric circuit with no element drawing current from it the same at every pt?
there should not be any diff.because
How is heat energy produced in electric iron?
A resistor placed across the power line: I squared R (current x current x resistance) = heat in watts.
What is a moving coil ammeter?
A moving-coil ammeter is an analogue ammeter, used to measure direct current. It works on the same principle as an electric motor, whereby a pivoted coil, located between the two poles of a horseshoe magnet, will rotate when current is passed through it. The movement is restricted by a pair of hairsprings, which means that the moving coil will move through an angle that is proportional to the current. A pointer, attached to the coil, sweeps across a suitably-graduated scale, to indicate the value of current passing through the coil.
Why is heat generated across a resister when electric field is applied?
An electric current contains energy; so does an electric field. When a current flows through a resistor, part of the electrical energy will be wasted - i.e., converted to heat. You can think of this as if some of the electrons crash into atoms, instead of continuing on their way.
What is the effect of density on conductivity?
*Electrical conductivity or specific conductivity [sigma] is a measure of a material's ability to conduct an electric current. When an electrical potential difference is placed across a conductor, its movable charges flow, giving rise to an electric current. The conductivity σ is defined as the ratio of the current density J to the electric field strength E : J=Sigma.E
