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How much charge is accumulated in dielectric that is charged by 4-A current for five seconds?
Codyallen96
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How long does it take a current of 5 milliAmpere to deliver 15 coulomb of charge?
Charge = (current) x (time)Time = charge/current = 15/0.005 = 3,000 seconds = 50 minutes .
If 5.0 Coulombs of electrons flow past the middle of a copper wire in 0.10 seconds then what is the electric current in that wire?
The current is 50 Amperes, 5/.1=50Coul/sec.
What is the unit for the equation H equals I2Rt?
The equation is referring to: * H = Heat in Watts * I = Current in Amperes, (therefore I2 = Current squared) * R = Resistance in Ohms * T= Time in Seconds or .....The amount of heat in a conductor would be: Current (Squared) x Resistance x Time
Can a capacitor create more Amps than is put into it at high voltages?
You better believe it, otherwise you're in for a surprise. A capacitor is a current storage device, and even when fed by a small charge from a (say) kV supply, it will eventually acquire the full capacitance charge at the charging voltage.The charge is stored as a distortion of the insulating material, and when it discharges, if into a low-resistance circuit, the current will be high.And with high voltage capacitors, there may be a small hysteresis of the dielectric, and this will relax back to a zero stress position only slowly.So you should discharge an HV capacitor several times, waiting a few seconds between discharges.This is a mistake many technicians make, but generally only the once!
Suppose a wire whose resistance is 2.5and 1.0 Amp of current for 1 second raises its temperature by 100 C What is the amount of current required to raise the temperature 100 C in 0.5 seconds?
resistance is 2.5 has no meaning. You need to include units!
What is dielectric discharge test?
The Dielectric Discharge (DD), sometimes called re-absorption current, test is performed during the discharge cycle after the test. There are three components of current (charging, polarization and leakage currents) present during a standard insulation test, which make it difficult to determine the dielectric discharge. Rather than measuring the polarization current during an insulation test, the DD test looks at the de-polarization and capacitive discharge currents at the conclusion of the insulation test. The device under test (DUT) must be charged for an adequate amount of time to be stabilized therefore, the only remaining current component is leakage current. The DUT is then discharged at the completion of the insulation test and the current flow is measured during a standardized time of one minute. This current is dependent on the overall capacitance and the ending test voltage. Dielectric discharge is calculated as: Dielectric Discharge = I (after 60 seconds) / Volts x Capacitance The DD test can identify excess discharge currents that happen when a layer of multi-layer insulation is damaged or contaminated. This condition will be missed by both the spot test and the Polarization Index test. Discharge current will be higher, for a known voltage and capacitance, if an internal layer is damaged. The time constant of this individual layer will differ from the other layers, causing a higher current than for insulation that is good. Homogenous insulation will have a DD value of 0 while good multi-layer insulation could have a value as high as 2. Source: http://www.aemc.com/
What is Dielectric test?
The Dielectric Discharge (DD), sometimes called re-absorption current, test is performed during the discharge cycle after the test. There are three components of current (charging, polarization and leakage currents) present during a standard insulation test, which make it difficult to determine the dielectric discharge. Rather than measuring the polarization current during an insulation test, the DD test looks at the de-polarization and capacitive discharge currents at the conclusion of the insulation test. The device under test (DUT) must be charged for an adequate amount of time to be stabilized therefore, the only remaining current component is leakage current. The DUT is then discharged at the completion of the insulation test and the current flow is measured during a standardized time of one minute. This current is dependent on the overall capacitance and the ending test voltage. Dielectric discharge is calculated as: Dielectric Discharge = I (after 60 seconds) / Volts x Capacitance The DD test can identify excess discharge currents that happen when a layer of multi-layer insulation is damaged or contaminated. This condition will be missed by both the spot test and the Polarization Index test. Discharge current will be higher, for a known voltage and capacitance, if an internal layer is damaged. The time constant of this individual layer will differ from the other layers, causing a higher current than for insulation that is good. Homogenous insulation will have a DD value of 0 while good multi-layer insulation could have a value as high as 2. Source: http://www.aemc.com/
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