# Circuit calcultions how to calculate current flow in a circuit?

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Use Kerchovs Law alongside Ohms Law.

Posted on Feb 10, 2014

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Posted on Jan 02, 2017

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## Related Questions:

### How to you make the impedance calculation?

Impedance is the opposition of a circuit to alternating current. It's measured in ohms. To calculate impedance, you must know the value of all resistors and the impedance of all inductors and capacitors, which offer varying amounts of opposition to the current depending on how the current is changing. You can calculate impedance using a simple mathematical formula.

1. Impedance Z = R or XLor XC(if only one is present)
2. Impedance in series only Z = ?(R2 + X2) (if both R and one type of X are present)
3. Impedance in series only Z = ?(R2 + ('XL - XC')2) (if R, XL, and XC are all present)
4. Impedance in any circuit = R + jX (j is the imaginary number ?(-1))
5. Resistance R = I / ?V
6. Inductive reactance XL = 2?Æ’L = ?L
7. Capacative reactance XC = 1 / 2?Æ’C = 1 / ?C

Sep 09, 2016 | Office Equipment & Supplies

Tip

### Basic Electricity And Electronics

Remember

1. Almost Every System in a vehicle uses some type of electric or electronic component.
2. An Atom consists of small particles called protons, neutrons, and electrons.
3. Negatively Charged electrons circles around neutrons and protons
4. Current Abbreviated I is the flow of electrons through a conductor
5. Voltage abbreviated V Or E is the force that causes electron flow
6. Resistance abbreviated R is the opposition to current flow.
7. Ohms's Law is a simple formula for calculating volts,amps,or ohms when two of the three values are given.
8. If A Magnetic field is passed over a wire an electric current is generated in the wire.
9. When A switch is closed, a circuit is complete. When the switch is open, a circuit is broken and does not function.
10. A Fuse Protects a circuit against damage caused by a short circuit.

on Apr 09, 2010 | Oldsmobile Cutlass Cars & Trucks

### Write the differences between alternating current (AC) and direct current (DC).

I will try, but understand, though we can harness electricity for power, there are still mysteries surrounding the existence and interaction of electric charge.
Alternating current is an electric current that reverses direction at regular intervals. All household current is alternating current. That is how it is generated through power lines, our electric grid, from the source like hydroelectric dams through power lines and into our homes.
Direct current is electric current going only one way in a wire or circuit. Automobiles run on direct current. Science says the flow of electrons in direct current only travels one way. Alternators in cars start out producing alternating current, but with an electric device called a diode, the current is changed to direct current. A diode will only let current pass through it in one direction, but stops current flow in a reverse direction. Before the invention or discovery of alternators, cars used a belt driven generator to produce direct current. Alternators proved superior in generating electricity, however, so were adopted by auto makers.
Now purists will add something more: by convention we say that current flows from the positive battery terminal, through the wire circuits, through an electric motor, and then to ground and thus back to the negative terminal of the battery. So from positive to negative, right? Well, electricity is a negative charged electron flow through a wire, so purists say the current flow is actually from the negative battery terminal through the wire circuits and back to the positive battery terminal. It is confusing, so by convention we say (DC) current flow is from positive to ground, or negative.
Well, there you go. Is it crystal clear, or whut??? Lol.

Nov 08, 2013 | Cars & Trucks

### What is my current rate

Which current are you referring to ??......

If you think of an electrical device as a piece of plumbing, voltage is the amount of water that you send down into the pipe, resistance is the pipe's relative width or narrowness, and current is the speed with which the water flows.
Power measures the water's relative difficulty or ease making its way through the pipe.
You relate all these values to one another using a common set of physics equations known as Ohm's law.
If you need to calculate electricity's current flow, you'll need to have at least two of the three values -- voltage, resistance or power -- listed above.

Calculate current flow using voltage and resistance.
According to Ohm's law, you can express electricity's current in amps as a ratio of its voltage in volts to the resistance of the device it's flowing through in ohms -- I = E/R, respectively.
For example, if you want to know the current flow of 220 V of electricity as it flows through a laptop computer with 80 ohms of resistance, you would simply plug these values into the equation as follows: I = 220/80 = 2.75 amps.
Calculate current flow using power and resistance.
Ohm's law also states that electrical current, "I," is equal to the square root of the power dissipated as it travels through the device divided by that device's resistance.
If a light bulb dissipates 80 watts of power and has a resistance of 55 ohms, you can calculate the electricity's current as follows: I = sqrt(80/55) = sqrt(1.4545) = 1.20 amps.

Calculate current flow using power and voltage.
If you have a space heater which dissipates 420 watts of power when it takes in 120 V of electricity, Ohm's law states you can calculate this electricity's current using the equation "I = P/E." For this example, compute current like so: I =420/120 = 3.5 amps.

http://www.the12volt.com/ohm/ohmslaw.asp

Aug 13, 2013 | Computers & Internet

### Code PO135 2006 Chvy Colorado. Where is this sensor located? Thanks

Is it a 2.8 or 3.5 ?
It should be located in the exhaust manifold of your engine See number 10 on the diagram if this was helpful please vote thanks and god bless.

DTC P0135
Circuit Description
Heated oxygen sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensor to reach operating temperature. Voltage is provided to the heater by the ignition 1 voltage circuit through a fuse. With the engine running, ground is provided to the heater by the HO2S heater low control circuit, through a low side driver within the powertrain control module (PCM). The PCM commands the heater ON or OFF to maintain a specific HO2S operating temperature range. The PCM determines the temperature by measuring the current flow through the heater and calculating the resistance. Based on the resistance, the PCM can predict the sensor temperature. The HO2S 1 uses pulse width modulation (PWM) to control the heater operation. The HO2S 2 simply uses ON/OFF commands to control the heater operation. For diagnosis, the PCM monitors the heater current with the engine running. The PCM also calculates the heater resistance on a cold start. Both diagnostics will only run once per ignition cycle.

If the PCM detects that the heater current or the heater calculated resistance is not within an expected range, DTC P0135 sets for HO2S 1.
ho

Mar 25, 2011 | 2006 Chevrolet Colorado

### When i want to use the % button in calcultes wrong. 100 + 20% =125? , how do i get this setting coreect?

Try to switch off it and switch on again.
If the problem still persists then go to the near by calculator shop and get it fixed

Feb 20, 2011 | Casio MS-80TV Scientific Calculator

### My calculator is set at a 5% tax rate. How do I reset it to a 6% tax rate?

Observe the devices function keys to ascertain any menu or mulltifunction buttons. Multifunction keys perform several features. First the multi key integrates several features to minimise the extraneous requirements wit micro computer keypads. Second, multifucntion keys perform the additional fucntions least visible at initial observation. Calculors as simple computers onlyl produce transaction requests though allowing to adjust features to suit productivity. Perform an observe of the device to familiarise with the adjustment status condition. In the instance were the device were dessign least to allow an alteration of calcultion percentages makes alteration unachievable. Refer to the devices oner user guide to ascertain the capacities if functionalities among several resources made available from the manufacturer.

Feb 13, 2011 | Casio DR-210HD Calculator

### Power windows wont work what fuses can i check i have replaces the driverside switch.

Fuses, Switches, Circuit Breakers And Relays
Check under hood and under the dash driver's side.
There may be a sticker on the inside of the panel cover that tells you the legend. Otherwise, it requires testing each and every one of those fuses, preferably with a fuse tester that can do it more expediently than pulling each one out and looking for a broken conductor.

Most vehicles use one or more fuse panels. This one is located on the driver’s side kick panel

It is possible for large surges of current to pass through the electrical system of your vehicle. If this surge of current were to reach the load in the circuit, this surge could burn it out or cause severe damage to the vehicle’s electrical system. It can overload the wiring, causing the harness to get hot and melt the insulation. To protect vehicle wiring, fuses, circuit breakers and/or fusible links are typically installed into the power supply wires throughout the electrical system. These items are nothing more than a built-in weak spot in the system. When an excessive amount of current flows through a circuit it causes an increase in heat throughout the wiring. Fuses and circuit breakers are designed as the weak link in the system and will disconnect the circuit to prevent damage to the components contained within that circuit. Components are equipped with connectors so they may be replaced in situations where they were damaged due to a power surge.
The following are descriptions as to how fuses and circuit breakers protect the electrical system:
• Fuse- A fuse is a weak link in the system designed to create an open circuit when the amperage flowing through that circuit exceeds the limits of the fuse. As the amperage increases, the conductor within the fuse heats up and eventually melts and breaks apart. This open circuit interrupts the flow of current and protects the components in the circuit.
• Circuit Breaker- A circuit breaker is a "self-repairing" fuse. It will open the circuit in the same fashion as a fuse. The surge creates heat the same way that a fuse is affected. When the surge subsides and the circuit cools down, the circuit breaker will reset and allow current to flow through the circuit. Typically circuit breakers do not need to be replaced.
• Fusible Link- A fusible link (fuse link or main link) is a short length of special, high temperature insulated wire that acts as a fuse. When an excessive electrical current passes through a fusible link, the thin gauge wire inside the link melts, creating an open to protect the circuit. To repair the circuit, the link must be replaced. Some newer type fusible links are housed in plug-in modules, which are simply replaced like a fuse, while older type fusible links must be cut and spliced if they melt
CAUTION
Always replace fuses, circuit breakers and fusible links with identically rated components. Under no circumstances should a protection device of higher or lower amperage rating be substituted.
Switches Switches are used in electrical circuits to control current flow. The most common use of relays and switches is to open and close circuits between the battery and various electrical loads in a circuit. loads are rated according to the amount of amperage they can handle. All of the current that the controlled load uses flows through a switch. Using a switch with an amperage rating lower than what the circuit is rated for could overload and cause damage to the components located on that circuit. Relays
The underhood fuse and relay panel contains fuses, relays, flashers and fusible links

Relays are used to control high-current loads with lower currents. Since these some loads require a large amount of current, the thickness of the wire in the circuit is also greater. If a switch were used to control the circuit, all of the current required to power the high-current load would have to pass through the switch. From a design standpoint, relays are used to limit current through switches and reduce the amount of heavy gauge wiring in the vehicle.
Relays are constructed of a set of switch contacts and a small electro-magnetic coil. When current flow through the coil a magnetic field is created. This field causes the contacts to touch, in turn completing the high-current circuit. Typically, relays are constructed so that the secondary contacts are open when the relay is de-energized (turned off). Circuits where relays are used include, but are not limited to, the horns, headlights, starter motor, electric fuel pump, blower motor and cooling fan motor.
Relays are composed of a coil and a set of switch contacts. The large wires connect a high current power source to one side of the relay switch contacts and from the other side of the relay switch contacts to the load. The smaller wires connect a low current power source to the relay control coil and from the control coil to the control switch and then to ground.

Load Every electrical circuit must include a "load'' (something to consume voltage from the power source). Loads are resistances included in circuits to limit current flow. Loads are the components installed in circuits, such as headlights, wiper motors, door lock solenoids. Without a load, the battery would flow all of its energy through a circuit directly to ground. This is called a "dead-short to ground". The unchecked flow of electricity would cause a great amount of damage to the circuit by developing a tremendous amount of heat. Short circuits can develop sufficient heat to melt the insulation of surrounding wires, even reducing a multiple wire cable to a lump of plastic and copper.

Jul 26, 2010 | 2001 Ford Taurus

### Integral of sinx how to calculte in casio fx991 es

Hello,
Configure the calculator to be in MathIO : [SHIFT][MODE][1:MathIO].
Press the Integral key, the one judt beloe the [ALPHA] key.
The template of the integral appears, with the cursor in larger rectangle. Enter the function the screen displays the integral, a small upper sqaure, and a small lower square. The left parenthesis of the function is already supplied by the calculator.
Press [ALPHA] X to enter the argument of the function.
Press the right parenthesis.
Remain the limits.
Use left arrow to move the cursor just before the s of sin and press down arrow to enter a numerical value for the lower limit.
Press the up arrow to move cursor in upper square.
Key in the numerical value of the upper limit.
Press [=].

Warning. To have meaningful result, make sure the angle unit used is conform to the problem you are trying to solve.

Hope it helps.

Nov 01, 2009 | Casio FX-300MS Calculator

### Calculating power of a fuel/air mixture

You will need to know the BTU value of each type of fuel to compare the difference of each to one another. Nito methane is not a fuel as such, it does bring extra oxygen into the mix.

Aug 07, 2009 | Yamaha Electrical Supplies

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