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Why are DC touch voltage limits higher than AC touch voltage limits?
Wiki User
∙ 13y ago
this is because in dc is steady current......so when a DC supply says 220v it means max possible voltage is 220 V
but on the other hand the AC ratings are written in terms of RMS values so wen an AC supply says 220V ,then the max voltage actually is 220*1.414(i.e sq. root 2)= 311V approx....so u see AC limit has to be kept lower than DC
Wiki User
∙ 13y ago
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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 might the unloaded output voltage of a transformer be higher than its rms of 12.6v?
Because the windings of transformers have resistance, the primary and secondary currents will cause voltage drops. To compensate for the drops, the transformer may have been designed to have a higher than specified output voltage when there is little or no output current. The no load output voltage typically is only slightly greater than the specified voltage. Before measuring the output voltage, measure the input (line) voltage. If it is not as specified for the transformer, calculate its effect on the output.
What is step up transformer?
To transmit a lot of electrical power, you either need a high voltage or a high current. But a higher current means your cables got hotter and you lose a lot of energy so is better to use higher voltage. To increase the voltage, we need to use a step up transformers. Step up transformers are transformers which has ability to increase the voltage and they have more turns on the secondary coil on the primary coil.
What is the acceptable voltage higher than 480v for a 480v inverter?
The voltage range should be marked on the case but without that information a 5% increase can be assumed, so 504 v.
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 is the purpose of capacitor in power supply higher than rated voltage?
The voltage marked on a capacitor is its MAXIMUM SAFE WORKING VOLTAGE. The capacitor will work in a circuit at any voltage lower than that, but it may fail at any higher voltage.
What happens when a capacitor when it is connected to a higher voltage?
If you apply a higher voltage to a capacitor than it is rated it could over heat and explode.
If the resistance in ohms is higher than the voltage what does that mean?
Voltage is not measured in ohms. It is measured in volts.
Is a 10 amp power tool better than a 5 amp?
At the same voltage yes, as the higher voltage is an indicator of a higher horsepower.
Why does zinc and copper create a higher voltage than copper and copper in a circuit?
It is very weird and I am gonna help. Zinc and copper create a higher voltage than copper and copper because zinc has a higher voltage than copper so copper plus zinc equals more than copper plus copper.
What happens when diode is supplied with a voltage higher than RIV in reverse bias?
when diode is supplied with a voltage higher than RIV in reverse bias, the diode will burn out and will have zero resistance.
What will happen to a motor if it is supplied with lower voltage than its rated voltage?
The amperage to the motor will go higher.
Can Two or more batteries connected in series generate a higher voltage than one alone?
Yes, two or more batteries connected in series can generate a higher voltage than one alone.
What is buck boost converter?
Any device that outputs a voltage higher than its input voltage. This device can be capacitive, inductive, or other.
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.
Can high voltage take out lights?
Yes, a higher than normal voltage that the equipment needs will shorten the life of any device.
If voltage is 127v does this use more kilowatts than if voltage were lower?
...maybe...The black and white answer is "yes". It becomes much more grey when you're question evolves into "how much more". It depends on what you're using whether this will really make a difference. A higher voltage into a light bulb will cause more current to flow, thus a higher power usage. A higher voltage into a computer will not increase power usage by much, because the internal electronics convert this into DC that is clamped to specific values (12 volts, 3.3 volts, etc.), and the parts of the computer function on this lowered voltage. There will be a larger amount of loss in the power supply. A heater will heat more at a higher power usage than at a lower power, so voltage being higher is irrelevant - it will simply run longer and cooler at lower voltage than at higher voltage.
