I understand all the concepts of what voltage is using all the analogies but some things related to the drop of voltage across a circuit confuses me.
If I had a short circuit and attached a voltmeter I would get a potential difference reading of 0 volts. How is current then going through the wire if it is 'X' volts at any point in the wire?
Let's say I have a DC 9V battery with a load in the middle. I read somewhere (probably mistaken here) that the voltage drop in this situation must be 9V or rather, that the sum of load resistances must be equal to voltage of the source. I mean, there is a variable amount of resistance to each load so at the base of the load I might have 9V and at the end of the load I might have 5V with a 4V potential difference.
for the first question, you normally don't have a "real" short
circuit, but a very low load (say a milliohm). In this case there
is a very low (non measurable with normal instruments) difference
of potential and this will cause the current to flow through your
load. The amount of current flowing in the load will depend on the
internal resistance of the generator. If the internal resistance is
Ri and the load resistance is Rl, with a open circuit potential
difference of V, the current will be
. If you had a proper zero resistance load (a real short circuit),
the difference of potential across the load would be exactly zero
but, being the resistance also zero, you would not need a potential
difference to support a current (think of electrons flowing
frictionless in your load, so you don't need to provide energy to
allow the electrons to win the friction, therefore current without
difference of potential). In this case the current would be
. This should help understanding the second question as well. If
your load is constituted by two resistors in series (say of
resistances R1 and R2), the total current in the circuit would be
, the difference of potential across the load would be Vl=I(R1+R2)
and the drops across the resistors would be V1=IR1 and V2=IR2.
I understand all the concepts of what voltage is using all the analogies but some things...
In this set of exercises (in the pre-lab AND lab), we will test/make the following assumptions: A flow exists in a complete circuit from one terminal of the battery, through the rest of the circuit, back to the other terminal of the battery, through the battery and back around i. the circuit. We will call this flow electric current For identical bulbs, bulb brightness can be used as an indicator of the amount of current through that bulb: the brighter...
1. In class we derived how a transformer can up or downregulate
the voltage in an electrical circuit with an alternating
current.
(a) Use the conservation of energy to deduce how the currents I1
and I2 must be related if you know the ratio of ε1/ε2 (for the
purpose of calculating the power delivered by a circuit ignore any
complications due to the fact that I(t) and ε(t) are
time-varying).
(b) In class I argued that power transmission is more...
relatively straight forward, please show all work!
2) Transmission losses Imagine that you want to provide power to a resistive element (a load) with a battery as shown in the diagram below. Your load needs 20W of power to operate. You have two choices: you can connect a 5V or a 12 V battery. a) How much current must run through the circuit in each case? b) The wiring in your dorm uses a standard 12 gauge wire size with...
1. Why can the DSO only measure node voltages when the Function Generator is the power supply in a circuit (unless it is using a current probe)? 2. Consider Figure 1. According to the calculations in the lab handout, if Z-1kΩ +/6914, then the phase difference (фи-фі) between u(t) and i (t) is 34.6". a. If this v(t) and i(t) were displayed on a DSO (v(t) being a node voltage and using a current probe for i(t) as shown in...
EG 171 Test Chapters 7 Date: 214れ ,3& Name 24. The amount by which the actual resistance can differ from the color-coded value is the: a. temperatare coefficient b. power rating e differiential resistance D tolerance 25. The resistance value of a chip resistor is determined from the size of the resistor three digit number printed on the body d. color-code c. three letters printed on the body True/False Indicate whether the statement is true or false 26. The practical...
A Investigation #11: Non-Identical Bulbs in Series and Parallel All of the circuits you have investigated so far have involved identical bulbs. If two bulbs are identical and one bulb is brighter, then the brighter bulb must have a larger current thru it. Furthermore, the larger current must be caused by a larger potential difference. In this investigation, you will study circuits for which the bulbs are not identical. We will illustrate that two Spherical bulbs are not identical by...
I need aome help with this part of my lab. thank you!
Kirchoff's Laws 4. Now click on this link, which is another circuit I modified and created for this lab: http://tinyurl.com/y8toda84 A. Do not Click run/Stop. This is a circuit that has elements that are neither series nor parallel, as well as multiple voltage sources. The best way for us to analyze this circuit is to use Kirchoff's laws. From the text here are Kirchoff's laws: 1) The sum...
I only need help with the discussion
there are many info that you do not need put I put just in
case as well as my data table.
please do it as soon as u can
Meauements ODeit1 Check2 Meaurements Checi3 Ced Check5 Check6 Measurements Check7 heck8 4058 33 536 1502 1035 979 119478 041 1.0319|0.554972| 64261| 153|15542033681 995781 5266566 1578807 298h 1631 119 1209430016 079096812 0.418135246 0,00032665 011890:004668155728441 0293237 1.291809502 1.22833 1.28 1952 -1116 4281 140616885511984206317 3346 8162 0.78...
CODE 102_8 Welding Many welding processes require the application of heat and/or pressure to produce a suitable bond between the two parts being joined. There are a number of conventional and commercially practiced welding processes, which possess limitations in relation to material type and thickness, and in addition, the cost analysis may not allow for a process to be used on a specific application. The selection of suitable welding consumable (electrode or wire) is also an important factor in producing...
summatize the following info and break them into differeng key points. write them in yojr own words
apartus
6.1 Introduction—The design of a successful hot box appa- ratus is influenced by many factors. Before beginning the design of an apparatus meeting this standard, the designer shall review the discussion on the limitations and accuracy, Section 13, discussions of the energy flows in a hot box, Annex A2, the metering box wall loss flow, Annex A3, and flanking loss, Annex...