P & K Solutions Inc Kansas City Mo Review
There are ii base of operations formulae which will assistance you to understand the human relationship betwixt current , voltage, resistance and ability. If you accept whatsoever ii of the parameters, you lot can calculate the other two parameters.
| OHM'S Police | |||
| BASE FORMULAS | P=I*E | East=I*R | |
| TO FIND VOLTAGE | East=P/I | E=I*R | E=SQR(P*R) |
| TO Detect CURRENT | I=P/E | I=E/R | I=SQR(P/R) |
| TO Detect POWER | P=I*E | P=E 2 /R | P=I two *R |
| TO FIND RESISTANCE | R=E 2 /P | R=E/I | R=P/I two |
| P = Ability in Watts Due east = Electromotive Force in Volts I = Electrical Electric current in Amps R = Electrical Resistance in Ohms SQR = Square Root |
| Note: I utilise 'East' to represent voltage most of the time simply sometimes you'll run across 'V' used for voltage. Don't let information technology confuse you lot. |
Change of Resistance:
In the following diagram, yous tin can see that the only difference between the diagrams on the left and the diagrams on the right is the resistance in each 'system'. The resistance in the faucet corresponds to the amount that the valve is open. In the wire, the resistance is the size of the opening* in the piece of wire. Yous can meet that the voltage/pressure is the same for both the left and right examples. What you should note in this diagram is... All else being equal, if there is an increase in resistance, the current catamenia will exist reduced. Y'all can encounter that the current flow in the rightmost wire is half of the current menstruum in the leftmost wire. This is considering the rightmost wire has half of the area for the electrons to pass through.
*Please notation that the size of the 'opening' is is coordinating to resistance. There is no concrete restriction in a real piece of wire.
With the formula:
I = E/R
You lot tin can run across that the current menses is inversely proportional to the resistance in the circuit.
And for those who are more graphically inclined...
Change of Voltage:
In the following diagram, you tin can see that the resistance in all of the systems is equal. This fourth dimension we made a change in the voltage/pressure. You tin come across that the increased voltage causes an increase in current even though the resistance in both the left and right systems is equal.
With the formula:
I = Eastward/R
Y'all can see that the current menstruum is direct proportional to the voltage applied to the resistance.
Mathematical Example: 
In the following example, we know that we have 12 volts applied to a 10 ohm resistor. If you want to know how much power dissipation in that location is in the 10 ohm resistor, use the formula:
P = E 2 /R
P = 12 ii /10
P = 144/10.
P = fourteen.four watts
The power dissipation in the resistor is 14.iv watts.
If you wanted to know how much electric current was flowing through the resistor, you would use the formula:
I = Eastward/R
I = 12/10
I = 1.two amps
The current through the resistor is i.2 amps.
If you want more than examples, the resistor folio has more than fun than a barrel of monkeys.
If you lot desire to try a few for yourself, the calculators below volition let you to check your math.
Observe: Power dissipation and Current menstruum from Resistance and applied Voltage.
An important note nigh the Flash demos/graphics on this site... The powers that be have deemed that the Wink content on web pages is too risky to be used by the full general cyberspace user and shortly, ALL of the support for it will be eliminated (most Flash access was eliminated 1-ane-2021). This ways that no modern browser will display any of these demos, by default. The set for now is to download the Ruffle extension for your browser. Ruffle Web Site. Please e-mail me (babin_perry@yahoo.com) to let me know if Ruffle is working well for you and what browser you're using.
An alternative to Ruffle is some other browser, Maxthon 4.nine.v.1000. For more than information on the Flash problem and Maxthon (standard and portable), click Hither.
Note:
In the post-obit demo, you lot can adjust the voltage and the resistance of the excursion. Changing either i will change the current flow and power dissipation in the circuit. You should realize that an amplifier produces a voltage into a given load. The combination of the two will result in ability dissipation (in the speaker'southward phonation coil in the case of audio). Since an amplifier can produce a express corporeality of voltage (limited by the internal power supply'south design), the power output is express when driving a given load (i.eastward. a 4 ohm load). To exist able to produce more than power, you tin can drive a lower impedance (resistance) load (within reason). This means that if yous go from a iv ohm load to a two ohm load, the power will double (bold that the power supply is regulated). If we utilize the case of a 100 watt mono amplifier (100 watts into a iv ohm load), we know information technology can produce no more than than 20 volts across the speaker. If you lot set the voltage slider below to twenty volts, and the resistance slider to 4, you can see that the power is 100 watts. If you move the resistance slider to two ohms, you can see that the ability is doubled (to 200 watts). At present, I know that I'yard showing a battery equally the voltage source (instead of an amplifier) but the concept is the aforementioned.
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Georg Simon Ohm:
Georg Simon Ohm was a German physicist that lived from 1789 to 1854. He discovered the relationship betwixt voltage, current and resistance in a conductor of a constant temperature (constant temperature is important because resistance changes with temperature and Ohm'south law doesn't bargain with the changing temperature/resistance). He found that, with a constant resistance, voltage and current were directly proportional (as nosotros showed in a graph above). This relationship tin can exist expressed as Five=IR where V is the voltage applied to the resistance, I is the electric current menstruum through the resistance and R is the resistance in ohms.
James Watt:
James Watt was a Scottish inventor that lived from 1736 to 1819. The unit of measure out for power, the watt, was named in his accolade.
James Prescott Joule:
James Prescott Joule was an English physicist that lived from 1818 to 1889. He discovered the human relationship between the power dissipated in a resistor and the electric current flow through the resistor. This human relationship can be represented by the formula P=I²R where P is the power dissipation in watts, I is the current catamenia in amps R is the resistance in ohms. Ohm is mostly given credit for the formulas which express the human relationship between Power, Current, Resistance and Voltage but the credit probably should go to Joule.
The 'Joule' as a unit of measure:
A 'Joule' represents the amount of energy used when one watt is dissipated for 1 2d (or 1 watt-second).
Source: http://www.bcae1.com/ohmslaw.htm
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