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To calculate the currents ir1 and ir2 in a parallel circuit of two resistors r1 and r2, consider the voltage across them. By Kirchoff's voltage law, the voltage across each resistor will be the same, so simply use Ohm's law to divide voltage by each resistor to get each resistor's current.
ir1 = v / r1
ir2 = v / r2
If you don't know voltage, but you do know total current, then determine the total resistance as RT = R1R2/(R1+R2), calculate voltage as ITRT and proceed from there.
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The voltage in a battery is 9 volts. The resistance is 3 ohms. What is the current?
There are a couple of ways to work this one. You can find the so-called branch currents (the current through each resistor) and then add them to get total current, or you can find the total effective resistance and then apply that information to the applied voltage to compute total current. Let's do this. I = E/R for each resistor. IR1 = E/6 = 9/6 = 3/2 = 1 1/2 amps IR2 = E/3 = 9/3 = 3 amps Itotal = IR1 + IR2 = (1 1/2) + (3) = 4 1/2 amps That's one way. Here's the other. Rtotal = 1 / [(1/R1) + (1/R2)] = 1 / [(1/6) + (1/3)] = 1 / [(1/6) + (2/6)] = 1 / [3/6] = 2 ohms Itotal = Eapplied / Rtotal = 9 volts / 2 ohms = 4 1/2 amps It checks. What a surprise. Ohm's law is correct.
Why is it economical to use high voltages for the transmission of electrical power?
Followings are few reasons. 1. At high voltage for the same power, value of current will be less. 2.If less current in line then less transmission loss(IR2) will occur,which will again save money. 3.If the current will be less then less size of conductor will be required and will save money. 4.If less size then less weight and less strength of poles will be required which will again save money. I hope will these reasons you can understand the fact.
What is the PI value of power transformer?
PI stands for polarization index. We need to find IR value(IR1) for 1min and again find the IR value(IR2) for 10min. PI=IR2/IR1
What is IR1 and IR2 connections for?
Infrared. They are for infrared sensors and similar devices. Most people will not utilize them.
What is the formula to calculate power dissipation?
P=ir2
Give the law of combination of resistance in series?
In series combination, Current(I) remains same among all the resistors, but voltage(V) changes. So: V(Equivalent) = I(Equivalent) * R(Equivalent) R(Equivalent) = V(Equivalent)/ I(Equivalent) R(Equivalent) = IR1+ IR2+...+IRn / I R(Equivalent) = I(R1+R2+...+Rn)/ I R(Equivalent) = R1+R2+...+Rn
The voltage in a battery is 9 volts. The resistance is 3 ohms. What is the current?
There are a couple of ways to work this one. You can find the so-called branch currents (the current through each resistor) and then add them to get total current, or you can find the total effective resistance and then apply that information to the applied voltage to compute total current. Let's do this. I = E/R for each resistor. IR1 = E/6 = 9/6 = 3/2 = 1 1/2 amps IR2 = E/3 = 9/3 = 3 amps Itotal = IR1 + IR2 = (1 1/2) + (3) = 4 1/2 amps That's one way. Here's the other. Rtotal = 1 / [(1/R1) + (1/R2)] = 1 / [(1/6) + (1/3)] = 1 / [(1/6) + (2/6)] = 1 / [3/6] = 2 ohms Itotal = Eapplied / Rtotal = 9 volts / 2 ohms = 4 1/2 amps It checks. What a surprise. Ohm's law is correct.
Definition of voltage divider?
Basically, if you have two resistors in series, then the total resistance is Rt = R1+R2. According to Kirchhoff's law, the total current entering a junction must be equal to the total current leaving it, so for a series circuit the current is the same in both resistors. From Ohm's law V=IRt and so from above V = I(R1+R2). This means that that total voltage in the circuit, V, is equal to the sum of the voltages across each resistor V1=IR1 and V2=IR2. This "divides" the voltage, so that for a 30V supply with two resistors of 10 ohms and 20 ohms respectively, the voltage across the first resistor will be 10V and the voltage across the second will be 20V. In this way a component requiring a lower voltage than the supply voltage can tap off from one of the resistors.
What is start speed of intermittent yo yo test?
According to http://www.topendsports.com/testing/tests/yo-yo-intermittent.htm: "There are two test levels: the Yo-Yo Intermittent Recovery level 1 (Yo-Yo IR1) test (designed for lesser trained individuals) starts at 10 km/hr and the Yo-Yo Intermittent Recovery level 2 (Yo-Yo IR2) test (aimed at well trained and elite athletes) starts at 13 km/hr, with both levels increasing in speed throughout the test."
What is the chemical formula for iridium?
Formula: Ir2(CO3)3
What is the chemical symbol of iodine?
Iridium: Ir, atom number 77, mass 192.2 a.m.u.
How would you measure power using one wattmeter in three phase?
There are several ways in which you can measure the power of a three-phase load, each of which requires the use of wattmeters, and the techniques vary according to whether the load is balanced or unbalanced. A common method is to use the 'two wattmeter method'. This cannot be explained here, but doing an internet search will provide a detailed explanation.Another answerUsing a DVM from L1 to L2 or L3. Basically any combination. They should all be equal though, no matter which combination. If they are not, then there is a problem with one of the legs.CommentThat is incorrect because you cannot use a DVM (digital voltmeter) to measure power.
What is the vizio television code for the cisco hda-ir2 remote control?
Easier and no codes are required; do the following: 1. Turn the TV on with your TV remote. 2. On the new remote HDA-IR2, press "Prog" and "TV" buttons at the same time until the red LED is on; release. 3. Press the "TV" button again to start the auto search and aim it towards your TV. 4. The remote will cycle through the stored codes. The TV will turn "off" when the right code is log in. You should imediately press "Prog" to stop the cycling, the code will then be saved in the new remote. 5. Press the "TV" on the new remote; your TV should turn "on". If not start over again..you were slow at pressing the "Prog" to stop the search. 5. Next program the Volume control, Press "Prog" and "TV", release, and press "Vol-" ... new remote will blink twice. This will control your black box volume. You can set the black box to near max and control the volume using the TV volume. 6. Now press "Prog" and "TV", release, and press "Vol+". You now can control the volume of your TV. If the sound is compresse or fuzzy, lower the black box volume. kaicho8888
What is the equation for power dissipated in a circuit?
The big power Formulas: Formula 1 - Electrical (electric) power equation: Power P = I × V = R × I2 = V2 ⁄ Rwhere power P is in watts, voltage V is in volts and current I is in amperes (DC).If there is AC, look also at the power factor PF = cos φ and φ = power factor angle(phase angle) between voltage and amperage. Formula 2 - Mechanical (mechanic) power equation: Power P = E ⁄ t = W ⁄ twhere power P is in watts, energy E is in joules, and time t is in seconds. 1 W = 1 J/s Scroll down to related links and look at "Formulas and calculations - Electricity and Electric Charge".
