Your unknown resistance is . between D and B points denote voltage drop across a Galvanometer. Once the Galvanometer shows zero deflection, the value of R2 is noted and hence unknown resistance can be known by using the formula. ...
What is the value of unknown resistance?
Hint: The value of the unknown resistance can be determined by using the wheatstone bridge principle . The wheatstone bridge principle shows the relation between the resistance which are connected in the circuit. By using the wheatstone bridge principle, the unknown resistance is determined.
How do you find the unknown resistance?
Each time you can calculate the unknown resistance using the formula:unknown resistance(a)=known resistance (b)*L/M . The value is found to be the same for all values of known resistance.
How do you find unknown resistance in a parallel circuit?
When any two resistors are unequal in a parallel circuit, it is easier to calculate R T by multiplying the two resistances and then dividing the product by the sum , as shown in below equation. Above equation, this is valid when there are only two resistors in parallel.
How do you calculate unknown resistance in meter bridge?
The specific resistance or resistivity of the material of the wire can be then calculated by using the relation, ρ=Lπr2X ; Where L be the length of the wire and r be its radius.
How do I calculate resistance?
If you know the total current and the voltage across the whole circuit, you can find the total resistance using Ohm’s Law: R = V / I . For example, a parallel circuit has a voltage of 9 volts and total current of 3 amps. The total resistance R T = 9 volts / 3 amps = 3 Ω.
How do you find resistance value?
- To find the Voltage, ( V ) [ V = I x R ] V (volts) = I (amps) x R (Ω)
- To find the Current, ( I ) [ I = V ÷ R ] I (amps) = V (volts) ÷ R (Ω)
- To find the Resistance, ( R ) [ R = V ÷ I ] R (Ω) = V (volts) ÷ I (amps)
- To find the Power (P) [ P = V x I ] P (watts) = V (volts) x I (amps)
What is a resistance box?
Definition: The box which contains the resistors of different values for estimating and comparing the resistance is known as the resistance box. The accuracy of the resistance box is very high. The main advantage of the resistance box is that the variable resistances are available at one point. ...
What is meter bridge?
A meter bridge also called a slide wire bridge is an instrument that works on the principle of a Wheatstone bridge . A meter bridge is used in finding the unknown resistance of a conductor as that of in a Wheatstone bridge.
How does the Wheatstone bridge measure the resistance?
A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit, one leg of which includes the unknown component . ... One of the Wheatstone bridge’s initial uses was for soils analysis and comparison.
How do you find equivalent resistance?
The equivalent resistance of a 4-Ω and 12-Ω resistor placed in parallel can be determined using the usual formula for equivalent resistance of parallel branches: 1 / R eq = 1 / R 1 + 1 / R 2 + 1 / R 3 ... Now the Ohm’s law equation (ΔV = I • R) can be used to determine the total current in the circuit.
Is current the same in parallel?
A Parallel circuit has certain characteristics and basic rules: ... Voltage is the same across each component of the parallel circuit . The sum of the currents through each path is equal to the total current that flows from the source.
What is current formula?
The current is the ratio of the potential difference and the resistance. It is represented as (I). The current formula is given as I = V/R . The SI unit of current is Ampere (Amp).
What is a standard resistance?
Standard resistors are very high precision resistors used as a reference to calibrate or verify the accuracy of other resistors in industry or establishments, on lines or production equipment. these are also used to check the accuracy of resistance meters by most manufacturers.
What is the formula of potentiometer?
A potentiometer consists of a long wire with uniform area of cross section which is made up of manganin or constantan. Potential gradient (K) is the potential drop per unit length. It is calculated as V/L , where V is the potential difference between two points and L is the distance between two points.
Which of the following is used for determination of unknown resistance?
Complete answer: The Meter bridge is the modification of Wheatstone’s network used to determine the value of unknown resistance. The meter bridge consists of a thin, uniform, and homogenous conducting wire AC, rectangular wooden board between two thick L shaped metal strips C1 and C2 as shown in the diagram.
