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You are, presumably, referring to alternating current, in which case the 'maximum' current is the peak or amplitude of the waveform. The 'average' value of current is zero, because the average value of the first half of each cycle is negated by the average value over the second half of each cycle. This is why a.c. currents and voltages are always expressed in 'root-mean-square' (r.m.s.) values which is the value of an a.c. current that does the same amount of work as a given value of d.c. current. The r.m.s. value for a sinusoidal current (and voltage, as voltage and current are proportional) is 0.707 times the peak or maximum value.

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What changes the voltage of a current?

First off, voltage and current are two completely different, yet related phenomenons.Kirchoff's law states that Voltage = Current * Resistance (V=IR. So, to change the voltage in a given circuit while keeping current constant, simply change the resistance.Open in Google Docs ViewerOpen link in new tabOpen link in new windowOpen link in new incognito windowDownload fileCopy link addressEdit PDF File on PDFescape.com


What is the difference between gG fuse and gM fuse?

The main differences between domestic and industrial fuses are the nominalvoltage and current levels (which require much larger physical dimensions) andtheir fault-current breaking capabilities. Type gG fuse-links are often used for theprotection of motor circuits, which is possible when their characteristics are capableof withstanding the motor-starting current without deterioration.A more recent development has been the adoption by the IEC of a fuse-type gM formotor protection, designed to cover starting, and short-circuit conditions. This type offuse is more popular in some countries than in others, but at the present time theaM fuse in combination with a thermal overload relay is more-widely used.A gM fuse-link, which has a dual rating is characterized by two current values. Thefirst value In denotes both the rated current of the fuse-link and the rated current ofthe fuseholder; the second value Ich denotes the time-current characteristic of thefuse-link as defined by the gates in Tables II, III and VI of IEC 60269-1.These two ratings are separated by a letter which defines the applications.For example: In M Ich denotes a fuse intended to be used for protection ofmotor circuits and having the characteristic G. The first value In corresponds tothe maximum continuous current for the whole fuse and the second value Ichcorresponds to the G characteristic of the fuse link. For further details see note at theend of sub-clause 2.1.An aM fuse-link is characterized by one current value In and time-currentcharacteristic as shown in Figure H14 next page.Important: Some national standards use a gI (industrial) type fuse, similar in all mainessentails to type gG fuses.Type gI fuses should never be used, however, in domestic and similar installations.vu_ld


How could you calculate the resistance of a circuit?

A variety of techniques can be used. Node-Voltage and Mesh-current (or Loop-current) methods, for example. See related link for examples. If there is a single voltage source in the model, then find the current supplied, and Resistance = Voltage/Current. {R = V/I} You could simulate/ model the circuit on a computer then apply the power profile and a current value will be calculated. Or if you have the circuit working, Place an amp meter into the circuit and measure the current. V/i = resistance.


Does plastic protect you from electric current?

No, practically all plastic is an insulator. An insulator does not carry any electrical currents. A conductor can carry a current. "What plastics are conductive?", you may ask -- see link below.


What does the interrupting capacity of a fuse indicate?

The interruption capacity of a fuse is the ability of a fuse to stop the current flow on a short circuit condition. On high rupture capacity (HRC) fuses the fuse cartridge has silica sand surrounding the fuse link. When the link blows under a high current so much heat is generated that the silica sand actually turns to glass to extinguish the arc. A dual element fuse is used on motor starting circuits. Their construction inside with two current flow paths allow the high current of a motor start for a short interval of time without blowing.

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