I was playing with my multimeter and I took the negative lead off the battery then I deicded to put the multimeter lead on the negative battery “cable” and the other lead of the multimeter on the negative battery “post” with the multimeter set on DC voltage,It read 11.3 or so volts is this normal?I’m thinking I might have somthing draining my battery,This was done with the key out of the ignition.

Thank you.

Hi i am rewiring some microwave transformers and i am rewiring the secondary with 8 AWG and as many turns as possible for low voltage and high amperage.

How can you tell which side of the primary contact is positive or negative using a multimeter?

How can you tell which side of the secondary is positive or negative using a multimeter?

i have 3 microwave oven transformers to rewire. how can i tell how many watts they were originally rated at if a already removed the secondary coils?

I am baffled by something I found in my science experiment… when I measured the voltage of a basic solution (house cleaner with ammonia) using a multimeter, I got a number of 1.6 DCV. But the next day, after having left the solution out for the whole night, I got a voltage of 3.0DCV!

I thought that maybe the water evaporated, and made it more basic, but my pH paper indicated that the pH of the solution was 11 before I left it out, and neutral after I left it out.

I read that ammonia also evaporates… but still, I don’t see why the voltage would be higher? Does anyone know why?

THANKS SO MUCH!
PS. The voltage numbers are on a scale, so I know that they are not actually that large… so please ignore that

A ____ can generate traffic in an attempt to reproduce a network problem and monitor multiple network segments simultaneously.

multimeter
Cable Performance Tester
Network Monitor
Protocol Analyzer

i know it’s one of the bottom 2 but i cannot find the answer in the book, thanks.

Hello,
I’m needeing some tech info. Possibly a schematic.
I’ve called just about everywhere I thought of but noone is willing to help me or give me the info I am looking for.

Upon removing my dnx6140 to install it in another vehicle I accidentally ripped the usb cord from my unit. I don’t want to have to send it back, I would like to wire a new one in. I am not afraid to solder if needed also as I am very good at doing these tedious things.

What I need to know is what order do the 5 pins from the female end connect to on a standard 4 pin male usb plug? There are 5 pins on the board on the radio. ( I do know for sure that the male end is a 4 pin usb) Just not sure how to reconnect it beacuse there are 5 pins on the radio.

I did check the pins with a multimeter and found the furthest one to the left is 5volts. None of the others reads voltage.

Again a schematic would be nice.
Thanks in advance for any help. I hope this post is clear with what I am looking for. and sorry if I am repeating myself.

What is the magnitude of the current in amperes?
A student designs an ammeter (a device that measures electrical current) that is based on the electrolysis of water into hydrogen and oxygen gases. When electrical current of unknown magnitude is run through the device for 1.60min, 11.0mL of water-saturated H2(g) is collected. The temperature and pressure of the system are 25.5C and 763torr.

This is due by Wednesday at 5p.

how do i carry out a continuity test on a lighting circuit with a multimeter and what the readings will be with and without faults on the circuit? A referral to a webpage with all this info would be just as good, thanks

A battery of e.m.f. 3V is connected to a 5 Ohm resistor with a very high resistance voltmeter placed across the resistor.
(i) The very high resistance voltmeter gives a reading of 2.8V. Show that the internal resistance of the battery is about 0.4 Ohm
(ii) A voltmeter with a resistance of 10 Ohm is used instead of the original one. Calculate the combined resistance of the voltmeter and the 5 Ohm resistor
(iii) Calculate the reading on this voltmeter

I can answer part (i), but I need help on the other two bits – I know basic principals, but I haven’t been taught the formulas or how to answer these types of question yet… Any help or answers or anything would be very much appreciated

Calculate the maximum AC current. Answer in units of A.

Would like something like a 220v, functionally simpler, DIY version of the kill-a-watt. Working with folks running an electric dryer by venting it into the small room containing the dryer. Though the window is open, the door is closed. I am betting not venting to the outside is making the dryer use about 1/3 more electricity, or more! (I think this because the intake air is so humid.) But I’ll need hard numbers to bring about change.

Please include references if possible.

I know to respect 220v current…