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Recent Resistor questions

I added a second momentary switch like Jasons example to an

I added a second momentary switch like Jasons example to an electric hoist by splicing into the pendant cord using a terminal block . Original pendant works fine but second switch only goes down . Original has stopand up down. Any help ?JA: How old is the system in question? And have you consulted an electrician yet?Customer: nnew and no.JA: Do you plan on doing the work yourself?Customer: yuesJA: Anything else we should know to help you best?Customer: no

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Sam Irvin

Electrical Systems Journeyman

122 satisfied customers
Help! I have a back feed problem that I have trace to the

Help! I have a back feed problem that I have trace to the 240v Hot water tank, it will back feed and charge all house circuits with 110 on the white common side of all outlets, and 220v on the hot black wire side, when I flip tanks circuit breaker everything is back to normal, when I flip tanks circuit back on, al. House circuit fine for a while, and then later back to 110 on common line and 220 on hot line.

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Mike G.

Master Electrician

Vocational, Technical or Trade Scho

10,512 satisfied customers
How do I test how many amps a transformer actually puts out?

How do I test how many amps a transformer actually puts out?I need to validate the 200 mA @ 24 VAC claim on a Transformer. I have some resistors but I don't know how to proceed with the wiring. I'm an ME so my electrical knowledge is very limited. Help anyone?

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Mike G.

Master Electrician

Vocational, Technical or Trade Scho

10,512 satisfied customers
I have a series-parallel circuit. Resistor 1 is 100

I have a series-parallel circuit. Resistor 1 is 100 ohm's and resistor 2 is 250 ohm's. Resistor's 1 and 2 are apart of . In another series is resistors 3 and 4, with resistor 3 being 350 ohm's and resistor 4 being 200 ohm's. What would the total resistance and total current be? This is the last question, thanks again.

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Kevin

Supervising Electrician

Diploma

4,832 satisfied customers
Two resistors color coded,, black, and silver are connected

Two resistors color coded brown, green, black, and silver are connected in series to a 9V source. What are the highest and lowest values of resistance given the color code, and what is the maximum current that could be drawn from the source?

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Kevin

Supervising Electrician

Diploma

4,832 satisfied customers
12v inverter question Do inverters use power when there is

12v inverter questionDo inverters use power when there is no load on the 12v supply?Since they are based on windings and current, is there still current flowing on the 120v winding when little is being drawn on the 12v supply?I have a heavy duty 110amp inverter for charging a tray of deep cycle batteries, but I have a use for a smaller 10 amp inverter I'm thinking of using it for. it will be running on a generator, so i don't want to pull more than needed off the genny and tryiong to figure out if I should use the heavy duty or just buy a smaller inverter.

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Kevin

Supervising Electrician

Diploma

4,832 satisfied customers
I have a workshop which requires a DC Voltage output of 12V.

i have a workshop which requires a DC Voltage output of 12V. i have a 36volt DC source available and the following resistors 1kohm, 4kohm and another 4kohm. how do idesign a circuit from the following to provide the correct output voltage

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Kevin

Supervising Electrician

Diploma

4,832 satisfied customers
I am re-wiring a small air pump. The wire that goes from the

I am re-wiring a small air pump. The wire that goes from the pump to the on/off switch has a small resistor attached to the wire where it connects to the switch. Only one lead on the resistor is attached, the other lead has been snipped off. The resistor is a very small one, five band, brown- orange-black-gold-brown. The best I can tell it is a 13Ohm 1% rating.What is the purpose of this resistors?Thank you for your help.

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Steve G.

Chief Engineer

13,448 satisfied customers
Are there metals (alloys?) that have a minimum threshold before

are there metals (alloys?) that have a minimum threshold before they will conduct electricity? As in, there needs to be a minimum voltage/current that goes through it before it stops acting as a resistor. My electrical knowledge is lacking, sorry in advance for layman's ignorance.

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Kevin

Supervising Electrician

Diploma

4,832 satisfied customers
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