Does Voltage at All Terminals Equal Input Voltage in a Simple Circuit?

  • Thread starter Thread starter Idea04
  • Start date Start date
  • Tags Tags
    Voltage Wire
AI Thread Summary
In a simple circuit with a 20-volt supply at the input terminal, the voltage at the output terminal will also be 20 volts above ground if no current is flowing. Voltage is a statepoint and does not travel down a wire; instead, it varies based on the position along the wire and the proximity to the voltage source. When current flows, a voltage drop occurs due to resistance, which is calculated as the product of current and resistance over the wire's length. Short-circuiting a battery results in high current and heat due to rapid chemical reactions, increasing the battery's internal resistance. Therefore, without current, all terminals maintain the same voltage relative to ground.
Idea04
Messages
194
Reaction score
1
I would like to know if there was a supply voltage of 20 volts (just voltage no current) on an input terminal. And there is a ground terminal and an output terminal. Will the 20 volts just be concentrated on the ground terminal where the connection is complete or will all terminal have a voltage of 20 volts.
 
Engineering news on Phys.org
The voltage is a statepoint, so voltage does not travel down a wire, but voltage increases or decreases along a wire depending on direction one travels along the wire or how close to the voltage source one is.

The current travels along the wire, and there is a voltage drop (gradient) associated with the current. The voltage drop is simply the product of the current and resistance over the length of the wire. The greatest resistance is usually found in a resistor or load as compared to conductor or wire which have low resistance.


One can short circuit a battery, which will cause it to get very hot as the current is very high and the chemical reaction is very rapid, and then internal resistance of the battery will increase.

If there is no current, the conductor attached to the output terminal will be 20 V above ground, assuming the ground is at the - battery terminal.
 
I have recently moved into a new (rather ancient) house and had a few trips of my Residual Current breaker. I dug out my old Socket tester which tell me the three pins are correct. But then the Red warning light tells me my socket(s) fail the loop test. I never had this before but my last house had an overhead supply with no Earth from the company. The tester said "get this checked" and the man said the (high but not ridiculous) earth resistance was acceptable. I stuck a new copper earth...
Thread 'Electromagnet magnetic field issue'
Hi Guys We are a bunch a mechanical engineers trying to build a simple electromagnet. Our design is based on a very similar magnet. However, our version is about 10 times less magnetic and we are wondering why. Our coil has exactly same length, same number of layers and turns. What is possibly wrong? PIN and bracket are made of iron and are in electrical contact, exactly like the reference design. Any help will be appreciated. Thanks. edit: even same wire diameter and coil was wounded by a...
Thread 'Beauty of old electrical and measuring things, etc.'
Even as a kid, I saw beauty in old devices. That made me want to understand how they worked. I had lots of old things that I keep and now reviving. Old things need to work to see the beauty. Here's what I've done so far. Two views of the gadgets shelves and my small work space: Here's a close up look at the meters, gauges and other measuring things: This is what I think of as surface-mount electrical components and wiring. The components are very old and shows how...
Back
Top