Whats is current,voltage,frequency and Amplitude?
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Electric current is the time rate of flow of electric charge through a circuit element. Natural examples include lightning and the solar wind, the source of the polar aurora. The most familiar artificial form of electric current is the flow of conduction electrons in metal wires, such as the overhead power lines that deliver electrical energy across long distances and the smaller wires within electrical and electronic equipment. In electronics, other forms of electric current include the flow of electrons through resistors or through the vacuum in a vacuum tube, the flow of ions inside a battery, and the flow of holes within a semiconductor.\n\nThe volt (symbol: V) is the SI derived unit of electric potential difference. It is named in honor of the Italian physicist Alessandro Volta (1745–1827), who invented the voltaic pile, the first chemical battery.\n\nFrequency is the measurement of the number of times that a repeated event occurs per unit of time. It is also defined as the rate of change of phase of a sinusoidal waveform.\n\nAmplitude is a nonnegative scalar measure of a wave's magnitude of oscillation, that is, magnitude of the maximum disturbance in the medium during one wave cycle.
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Impedance and voltage are two different things. Impedance is like a complex version of resistance. Voltage is the potential. \n\nVoltage V\nImpedance Z\nCurrent I\n\nV=Z*I
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1.  not enough info\n2.  conduction?\n3.  conductor\n4.  resistance
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... or to use the hydraulic analogy, current is how much water (electrons) is flowing through the pipe.  Voltage is the water pressure.
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Need more information. Why are you people bellow suggesting you can just increase current?, you cannot if your load (resistance/impeadance) and voltage remain the same. Current is the result, Voltage and resistance are the only two forces that can be manipulated directly. Just because you read something, doesn't mean it can be applied in the real world.
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V=It/C\n\nwhere\nI is current in amps\nV is voltage in volts\nt is time constant in seconds\n\nIn an ideal capacitor, this holds true.  Theoretically, an ideal capacitor has no leakage current and no inductance.
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I will put it in the order that is easiest to understand.\n\nAmpere: the speed at which electrons pass through\n(1A = 1 coulomb/second, where 1 coulomb is 6.24x10^18 electrons)\n\nWatt: the speed at which work (in joules) is done\n(1W = 1Joule/second. A joule is the amount of work, in Newtons (if you've done physics) x meters,)\n\nVolt:  Watts per Ampere, or Joules per Coulomb\n\nOhm: The RESISTANCE, by Volts per Ampere.
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Ideally a capacitor has an infinite resistance (which is a DC measurement). However the AC equivalent of resistance, reactance (usually denoted as X), tells you how much AC current a capacitance passes with a given AC voltage applied across its terminals. Reactance depends on the AC frequency. It is X = 1/(C*W), where C is capacitance and W (omega) is 2*pi*frequency. Similarly to Ohm's law, you can find average current from E = I*X. Unlike Ohm's law, this is true for average current but not for instantaneous current, since E and I are 90 degrees out of phase.
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For a picture of a sine wave, see\n\nhttp://en.wikipedia.org/wiki/Sine_wave
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Voltage is the power potential.  Current is the speed and power at which that voltage goes through a given medium.  \n\nThink about this, Hoover dam.  It has inordinate amounts of potential.  If it sprung a small leak at the top and shot out watter, the force of that wouldn't be much at all to hurt you.  But, if you blew an 8 foot wide hole at the bottem of the dam, the force of the water would disentegrate you in an instant.\n\nElectricity was a very difficult concept for me to get.  However, when you start comparing it to something that is easy to see, touch, and feel, then it helps a lot.  Water is a perfect analogy in many ways.
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Potential, kinetic, chemical, electrical, and thermal.
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Volts.  The the force behind electricity. Ampere is the mount of current. Ohm is the unit of measure for resistance.
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The voltage in alternating current oscillates up and down above and below zero, ideally with an average voltage of zero. Now using sense you could describe the voltage as zero, but this would not describe the signal properly; you need to know where you are on the wave (picture a sin wave) to know what the voltage is at a particular instant. A system called phase is used for this, describing how far you are into the wave pattern by degrees. The distance (in time) from one wave crest to the next is 360 degrees for example. An alternating system is ony fully described by magnitude AND phase. A three phase system actually has three waves equally spaced (120 degrees apart).
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ohm, V/m, Amp  <--- with the exception of flux, those units were set as those by the SI
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By Ohm's Law, current = voltage / resistance\n\nTherefore the current is 120 / 2 = 60 amps (answer b)
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A volt is a unit of voltage, while an ampere is a unit of current, or amperage. You can think of voltage as how much "push" the electricity has. Current is how much charge is moving through over time (1 A = 1 C/s). For a given resistance, more voltage means more current - they are directly proportional, but not the same thing. V = IR, where V is voltage, I is current, and R is resistance.
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Ok...you guys got this all wrong.  Voltage doesn't travel.\nThis is simple:\n\nSeries:\nAll series stuff see the same current\n\nParallel:\nAll parallel stuff see the same voltage