# Questions tagged [ratings]

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### Is G2RL-1A-E a suitable replacement for G2RL-1A-E-HA relay in dishwasher

I'm trying to figure out if the G2RL-1A-E power relay is a suitable replacement for a G2RL-1A-E-HA relay. When I study the datasheet, the only difference I see is that the market code distinguishes ...
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### Why do some DC to DC converters use high inductor values (ie: 220uH or more), while some of them use much lower value inductors (ie: 3.3uH or less)

I've noticed that many DC to DC converters that have have almost the same current output will have inductors that vary vastly in their rating. For instance, I've got two separate buck-boost modules ...
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1k views

### Technical explanation desired: are TVS safe for continuous dissipation? Why/why not?

In answers such as this one, https://electronics.stackexchange.com/a/647135/311631 I've seen suggestions that TVS diodes are not "reliable" under repetitive or continuous operation, such as ...
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1 vote
3k views

### What determines the voltage rating of a cable, and why do some cables have $U_0 = U$ while others have $U_0 < U$?

Just as an example, let's consider two cables, with voltage ratings being respectively 300/300 V and 300/500 V. My understanding is that voltage rating is an indication of the quality of the ...
616 views

### Resistor Power Rating and Pulses

I'm really confused with resistor power rating and pulses. I'm trying to determine the power rating of a resistor that will receive pulses of potentially 40 volts for 15 milliseconds. During this ...
4k views

### How are switch ratings determined? [duplicate]

As the only functionality of a switch is to interrupt the flow of electricity, it acts like a small resistor right? Lets say that we have a switch that its max ratings are 3A/250V AC. So if we connect ...
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129 views

### Transformers in series: Equal input/output voltage ratings, unequal power ratings

I am learning electronics and needed a negative rail. I have two transformers that have the same rated input/output voltages but different power ratings and manufactured by different companies. ...
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50 views

### Power Rating of a HV resistor

I am conducting a project to measure Breakdown Voltage and would like to use a protection resistor, please see below. When breakdown happens I will have something like In this case the Power ...
185 views

Looking at an ENTSOE paper, I have seen this table in which the typical ''loading factors'' of different generation types are listed (see figure below). But, what is this???? I was supposing that it ...
809 views

### Operating above maximum characteristic supply voltage, but below absolute maximum voltage

I'm using an Alliance parallel SRAM IC, and under the Electrical Characteristics table, it says VCC can be min 3.0 V, max 5.5 V. In the Absolute Maximum Characteristics table, it says terminal voltage ...
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94 views

### Mysterious component marking

I have stumbled across this component which I’m trying to replace. It has a rating of 22mΩF. It looks to be a resistor but I am confused as to why there is an ‘<...
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1 vote
127 views

### What do you mean by 240Y / 131 V network specification?

I was referring an industrial control panel guide for North American market for the network specifications. The specification mentioned a voltage rating 240Y/131V. I am curious, how would one get a ...
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119 views

### Choosing rheostat ratings

I want to control a heated pad with a rheostat. My heated pad has a power rating of 30W and supply voltage of 12V DC. How do I calculate the ratings required for my rheostat and plug adapter? I have ...
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1 vote
151 views

### Is the voltage rating printed on capacitors always DC?

Are there any cases where the voltage value printed on the capacitor is actually AC, like on film caps designed specifically for AC/Pulse operation? Or is the value printed on the capacitor always DC?
241 views

### Can I use a .75 HP inverter drive in place of a .5 HP one?

I am trying to replace some .5 HP 3-phase AC 240V motor drives with a different brand. The new brand doesn't seem to offer a .5 HP variant. Would the .75 HP variant work? Edit: A little twist -- the ...
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1 vote
249 views

### What do these dual DC rating numbers on my Casio PB-2000C mean?

All devices I own except one have only one rating that matches what the PSU says, for example "12V ⎓ 2.5A" and that means if I have to get a replacement PSU it has to be 12V and at least 2....
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255 views

### Minimum switching capability/Minimum permissible load for a relay

I am working with a DC relay thats contacts are rated at up to 10 amps at 600v. I am aware relays also tend to have a minimum switching current, however none is listed for this relay and this seems ...
49 views

### Rated voltages for the Cage clamp connectors?

what does the rated voltage for a connector means? How should we select the connector for a 230V AC application? Let us say can I use this connector for my 230V AV application? https://www....
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1 vote
117 views

### Meaning of "Supply Voltage: 3~132V" on an electric drive system plate? [closed]

I have an electric drive system for a garage door that has the supply voltage mentioned above. What does the 3~132V mean?. The output torque is 190 NM and the output speed is 85 rpm. The input current ...
457 views

### AC voltage rating of the capacitor

I am using a capacitor which is rated for 630V DC. I want to know the AC voltage rating for this capacitor. This is the capacitor. This is its datasheet.
911 views

### Voltage and current rating of electrical systems

Why voltage and current ratings of almost all electrical systems are RMS value of voltage and current not peak value of voltage and current? First I thought maybe because mostly ac input is sinusoidal ...
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1 vote
423 views

### Confused about battery rating specifications [duplicate]

I'm confused about how to understand battery capacity by its ratings. I though I understood Amp-Hours, as a nominal rating where they usually specified a period of time where that rating was ...
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771 views

### Replacing brushless motor (starting) capacitor with one of a higher capacitance

My kitchen hood vent is malfunctioning, the motor driving the fan is buzzing at different intensities depending on the speed I select. I took down the unit and if I give the fan blade a spin, it ...
180 views

### What does a 5.5 VDC rating on a super capacitor imply?

I'm confused as to what a 5.5 VDC rating on super capacitor implies. Is this with respect to 5.5 VDC tolerance, impedance, or feedthrough? You can find the product details at: https://www.mouser.com/...
117 views

### Battery mAh and device operation

If a small signal electronic load is designed for normal operation by using say 1.2 V 630 mAh battery and if the same battery is replaced with say 600 mAh or say 700 mAh rating battery, does it affect ...
• 503
221 views

### Multi valued Relay Ratings

I am not much experienced using relays. Earlier I used any relay with any setup just for the purpose of building something. But now I wish to make efficient and safer projects. For that purpose I was ...
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6k views

### Understanding relay contact ratings

The "ice cube" relay in question is allen bradley's 700-HC series. I was browsing through the spec sheet looking at the electrical data to make sure that the relay has the proper voltage/current ...
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224 views

### How is a transistor power calculated

I refer to a 2N3055 power transistor, the spec. sheet gives the following: Max. current 15A, Max. Voltage 50V, Power rating is 115 Watts. What is the power rating calculated on? If it is E*I ...
10k views

### Is C0G a synonym for NP0?

This question is in the context of a production environment where part numbers and change notices are strictly controlled, and any alternate manufacturer parts under an internal part number must be ...
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### If a capacitor has a low voltage rating, why isn't it damaged by low current, high voltage static charge?

Capacitors usually have a voltage rating marked on them. From what I gather, it's the maximum voltage it can withstand without being damaged. Let's assume you have a 35V capacitor and you rub your ...
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1 vote
157 views

### Modifying a buck converter for lower current rating

I have been learning about buck converters and I think I understand the principle of their design. However, I am unsure of how a current rating would be calculated for a particular design. The ...
4k views

### Difference between [W] and [WS] power rating of resistors

I see some datasheets of power resistors where power ratings are in Watts [W] and some in [WS] which I don't know what they mean. What is the difference between them? Example of datasheet Some ...
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### Does the wattage of a resistor factor into the resistance of a resistor?

Resistors come in a variety of different ratings based on wattage. As a rule, lower wattage resistors are smaller than higher wattage resistors. I understand the wattage determines roughly how much ...
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1 vote
231 views

### replacing obsolete HEMT and differences between Package/Case and Supplier Device Package

I've been designing an amplifier, with ATF33143 as my HEMT in mind. Yet, I just found out the said HEMT went obsolete. So I started looking at SKY65050-372LF as a possible replacement. On the DigiKey ...
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207 views

### How to spec out a relay correctly

I have a load that I am trying to switch with a relay. The load to the relay is an autotransformer. The wiper output of the autotransformer is (2) 120:30 step down transformers with each having 150W ...
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432 views

### Connector current/thermal rating

This question started as a design specific question but is (now) more of a general question going forward onto other PCB product designs... For now, I am designing an I/O PCB and want to mix supply ...
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3k views

### Difference between Rated Load & Max. Switching Voltage on Relay Contacts

Under the 'contact ratings' of a relay datasheet, there is a row for rated load, which specifies a 10A 30VDC load on both NO and NC contacts. There is another row which is the max. switching voltage ...
104 views

### Electromagnetic switch

I have a a electromagnetic level switch with DPDT contacts. Its rating mentioned is 230Vac, 60VA, 1A. My concern is what will be the DC equivalent for this rating. I have 24Vdc available from PLC and ...
3k views

### Why are there two different output voltage ratings on some power supplies? and How it works? [closed]

some power supplies (ex. chargers) have two different output voltage ratings like: 5V 2A OR 9V 2A -why is that? -How the charger knows that my load needs 5V or 9V? and not damaging the load -...
776 views

### resistor power rating [closed]

After 100 mSec, switch (SW) is going to bypass the resistor permanently. what should be the wattage of resistor? In image voltage source is of 700V, R=7ohm, L=330micro Henry, C=1.36mF.
1k views

### Switch Current Rating - Current Maximum

I've searched through a lot of threads regarding this and found some answers, however, the data sheet I am provided has some information which is causing some confusion. I have a switch with the ...
457 views

### Apple AirPods watt hour meaning [closed]

I have a part of Apple's product information sheet and I was wondering if I can make an assumption : I am wondering if I can say : "hmm, if the Wh rating of AirPods Charging Case is 1.52Wh, then a 5V ...
1 vote
321 views

### Whats the relation between AC power strip current rating and DC output current from the PSU connected on

this is kind of a noob question: I have a power strip (extension cord from my wall AC outlet) that is rated for 250V 10A. Over this power strip i'm connecting a power supply that gives an output of ...
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1 vote
92 views

### Is meaning of rated voltage not always same?

Well, I'm stuck in choosing DC barrel jack which will supply power for my circuit board from 12V 1.5A AC/DC adapter. Its spec says voltage rating is 18V and current rating is 1.5A. Well.. I know that ...
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### How can I test battery for true mAh rating?

Is there a way I can test the capacity of a 3.7v rechargable lion battery like this at home? All I really have is a multimeter. (Image source)
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A lot of resistors, like This one, are rated both for breakdown voltage and for maximum power. Well, this is probably a stupid question, but if a 10MOhm resistor is rated for 10kV, 1Watt, certainly at ...
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### Power Mosfet Gate Voltage

The early Power Mosfets were deemed to be fully enhanced with 10 VDC between gate and source. The gate source threshold voltage was defined for 1mA drain current and would be between 2 and 4 VDC. The ...
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### Verifying supercapacitor capacity

I have procured some supercaps. No datasheet was provided. The only data I have is what is printed on the caps themselves: "4.0F 5.5V cda®" Since my DMMs don't ...
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1 vote