Why current harmonic higher than voltage harmonic?

What happens to current flow when the resistance is higher than normal?

For a specific voltage, current flow is inversely proportional to resistance.

Does a step-down transformer increase its voltage and and decrease it's current?

No. A step-down transformer's secondary voltage is lower than its primary voltage. The secondary current is determined by the load, and this causes a higher current in the primary winding.

What is buck boost converter?

Any device that outputs a voltage higher than its input voltage. This device can be capacitive, inductive, or other.

What is harmonics in electrical circuits?

By simple definition, harmonics are any "non-linear" current or voltage in an electrical distribution system. An electrical harmonic shouldn't be thought of as an acoustic or vibrational harmonic, but simply as any electrical device that draws current un-proportionally to voltage. Harmonics are commonly produced by devices that rectify AC Voltages into a DC Voltages. Common harmonic producing devices are VFDs, lighting, and computers.When do harmonics cause problems?Current HarmonicsThese important bridge rectifier circuits produce current harmonics. Current harmonics do have an affect on the electrical equipment supplying harmonic current to the device (transformers, conductors). Current harmonics can cause issues with distribution equipment which has to handle the current from the utility transformer all the way down to the device, but generally don't affect other equipment connected to the electrical system. Harmonic currents can cause excessive heating to transformers. For electrical systems feeding single phase loads the third harmonic has gained attention in design consideration and transformer selection for causing the neutral conductor to draw excessive current.Voltage HarmonicsVoltage harmonics can effect sensitive equipment throughout your facility. Voltage harmonics arise when current harmonics are able to create sags in the voltage supply. When any device draws current it creates a voltage dip which is required for current to flow. This voltage dip is visible with larger loads when turning on a hair dryer or a table saw and seeing the lights dim down. The amount of sag depends on many factors like transformer impedance wire size. Current harmonics create voltage harmonics, but the magnitude of the voltage harmonics depends on the "stiffness" of your electrical distribution's "system impedance."An example to help understand current distortion verse voltage distortion is the common CFL light bulb. This low cost light bulb may have a 75% current THD (total harmonic distortion). This means that 75% of the current drawn by the bulb is considered "harmonic current". These light bulbs usually do not affect other devices in your home because even though the current drawn by the bridge circuit is rich in harmonic current, it creates very little sag in your home's voltage supply, and if you had a voltage analyzer attached you would probably see a voltage THD of well less than 1 percent.Avoiding Harmonic IssuesIf possible it is best to select equipment with a low current THD, and the result would be reduced voltage THD. If you are not able to purchase equipment with a low current THD there may be options available to you like adding line chokes or isolations transformers to reduce the harmonic currents. If you are unable to reduce current distortions and are having issues with the affects of voltage distortion there are options, such as tuned capacitor to supply harmonic current, or possibly redesigning your systems distribution to reduce system impedance.Solutions for Mitigating HarmonicsThere are many solutions to alleviating the affects of harmonics, below are some commonly applied solutions.Reduce Current HarmonicsAdd line chokes to harmonic producing equipment.Add isolation transformer to harmonic producing equipment.Use 12-pulse or 18-pulse rectifier circuits, instead of 6-pulse.Reduce Voltage HarmonicsAdd tuned capacitor banks to supply harmonic current, or change transformer size/impedance.OtherIsolate sensitive loads instead of mitigating harmonics.

Why does my home AC charger charge my iPhone so much faster than my automobile DC charger?

Phone will charge faster with a larger charging current. Charging current depends on voltage, so your home charger likely has a higher voltage and therefore a higher charging current.

Can you charge a 12volt battery with a 6volt charger?

NO, a 12 volt battery cannot be charged with a 6 volt charger. To charge any battery, the charging voltage has to be, at least, slightly higher than higher than the voltage of the battery. Current flowing through the battery is what accomplishes the charging, and no current will flow at or below the voltage of the battery to be charged.

What is the harmonic factor in a power system?

Two factors reduce the power used by a piece of equipment compared to the volt-amps drawn from the supply: power factor and harmonic factor. Both factors increase the power transmission losses incurred in supplying a given amount of power.The power factor is less than 1 when voltage and current are out of phase with each other.When they are in phase the power equals the volt-amps except for a nonlinear load with a current that is not proportional to voltage. This generates harmonics in the current and the effect is that the power is less than the volt-amps, by an amount equal to the harmonic factor.

When testing a power transformer with an ohmmeter which winding should have the largest ohmic value?

The higher-voltage winding has more turns (therefore its conductor will be longer) than the lower-voltage winding and, because it will carry less current, its conductors will have a lower cross-sectional area. Consequently, the higher-voltage winding will have a higher resistance than the lower-voltage winding.

Why is capacitive voltage higher than inductive voltage in an R-L-C circuit?

It isn't necessarily so. The capacitive voltage is the product of the current and capacitive reactance, while the inductive voltage is the product of the current and the inductive reactance. So it depends whether the capacitive reactance is greater or smaller than the inductive reactance!

What happens when a relay is operated beyond its rated voltage or current?

Generally speaking, a relay is an electrically operated switch. As such, there are two sets of ratings associated with a relay. The operating voltage will be specified, and the ratings of the contacts are also set down. As regards exceeding the operating voltage, this will cause excessive current to flow in the relay when it is energized. If the voltage is not significantly higher than the rating, and if the relay is not operated often or for long, it will function normally, but probably with a shorter life. At some point, excessive operating voltage will cause the coil in the relay to fail. Operating a relay to energize an electrical circuit with a higher voltage or current than the relay is designed for will shorten the life of the contacts in the relay. Higher voltage and current will quickly burn the contacts and destroy them. This is particularly true if that voltage or current is significantly higher than the ratings set by those who designed and constructed the relay. Things might work for a short time, but not for long.

Why is output dc higher than input ac?

Output power can never be more than input power. With a transformer, it is possible to increase the output current (while decreasing the output voltage), or to decrease the output current (while increasing the output voltage).

What is current gain and voltage gain?

Current gain is the ratio of output current divided by input current. Voltage gain is the ratio of output voltage divided by input voltage. Nothing more complicated than that.