voltage

Consider a DC motor driven by a DC supply. When supply voltage is suddenly reduced back emf becomes momentarily more than the supply voltage, which should drive a current in the circuit opposing the polarity of the supply. Will this damage the DC supply due to wrong polarity?

i have a circuit with 2 resistors in series (15kohms and the other is only 40ohms) then 3 resistors in parralell and they are (25kohms, 50kohms and 150kohms) the voltage is 24v and thats all the information that is given. i have to work out the: total resistance of the circuit, the total current...

i have a circuit with 2 resistors in series (15kohms and the other is only 40ohms) then 3 resistors in parralell and they are (25kohms, 50kohms and 150kohms) the voltage is 24v and thats all the information that is given. i have to work out the: total resistance of the circuit, the total current...

What happens to current through a DC motor as it is slowed, explain using Kirchoff's Voltage Law and Faraday's Law. Thanks! Oh and by slowing down the DC motor, I mean as in physically touching the DC motor to slow it down (basically increasing the resistance I believe)

Hi there, I have a 30 V dc power supply. I want to have a 12 V output from this. Can someone suggest a proper way to do this? I couldn't find a suitable voltage regulator.

My phone is a Sony Xperia. For example, at any given time, the battery voltage is reported as 3.915V. Now, when I plug in the charger, the voltage is reported to be 3.810V. When I plug out, the voltage increases again to 3.915V. Why does the reported voltage decrease when I plug in the...

current? You could also help me out by telling me how I could get them myself using the appliances and gadgets I have at home. Thank you!

current? You could also help me out by telling me how I could get them myself using the appliances and gadgets I have at home. Thank you!

I was planning on using AC voltage for my HHO cell, but many people are using DC voltage. Is this necessary/better?

i need that if any one have a answer

I installed a 12v after market Voltage regulator in my Vw beetle yesterday I think i got all the wiring right but.... when i start the car my generator light is on and my battery light is on they dont turn off when i start the car, they never used to do that before i just had to change out the...

Last night I broke the charger for my phone, so I've been using my car charger in the mean time until I get a new one. It's not too big of a deal or anything, but it's really inconvenient so I started looking for a spare charger with the same connector tip. To my luck (or not) I found one with...

Guys, I just learnt about current and terminal pd, and emf and all the rest of it. We learnt that a current against terminal pd graph has a negative slope, with the y-intercept being the emf of the battery. The only thing I don't understand is why is the slope negative? I know V = E - Ir, and...

I need to convert a pulse width signal to a steady DC voltage. The catch is, this voltage will be fed into a voltage-controlled oscillator, so a simple RC filter isn't good enough. I need as little ripple and as fast a transient time as possible. Also, I need it to perform really consistently...

I need to increase voltage in my dc circuit which is powered by a DC motor, how would i go about doing this?

Hi, my rear bulb on my car has gone so i took the bulb to the shop and it's a P21/5W 12V however they have given me a P21/12W 24V and said that it will be fine, will it? Just thought it must be 5w and 12v for a reason? Not being an expert on electrics just thought i'd check. Thanks

DC brushless three wire motor input voltage is AC or DC

is it possible to find by computation the Vdc or Vrms across a load with the usage of an SCR?

...anyone help out with this? a 5 V mobile phone charger from a 9V battery using a voltage divider circuit. The mobile phone rechargeable batteries are NiCd type, thus a 50mA charging current must be supplied for charging the batteries.

...Infiniti Nano Silver Hair Straightener? http://ecx.images-amazon.com/images/I/31lnhmLSd2L._SL500_AA280_.jpg http://essentialgearguide.com/1/wp-content/uploads/2008/12/conair-infiniti-nano-silver.jpg and if yes then please share the link where u saw it can you please also share models of...