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Electrical resistance is also known as specific electrical resistance. The SI unit of electrical resistivity is Ωm. Following is the formula of electrical resistivity: \ (\begin {array} {l}\rho =\frac {E} {J}\end {array} \) Where, ρ is the resistivity of the material in Ω.m. E is the electric field in V.m -1.
Resistance. Resistance is the measure of opposition applied by any object to the flow of electric current. A resistor is an electronic constituent that is used in the circuit with the purpose of offering that specific amount of resistance. The resistance of any object is computed making use of the formula:
The electrical resistance of a conductor can be calculated with Ohms law when the current and the voltage drop across it is known. The formula to calculate the resistance using Ohm’s Law is given as follows: \ (\begin {array} {l}R=\frac {V} {I}\end {array} \) where, R is the resistance of the resistor R in ohms (Ω) V is the voltage drop in ...
Dimensional Formula of Resistance. The dimensional formula of resistance is given by, M 1 L 2 T-3 I-2. Where,
Calculate the value of resistance of a 2-meter-long wire with a cross-sectional area 1.7×10 -5 m 2 and resistivity 1.86×10 -7 Ohm-metre. Given, Length of the wire L = 2 m. Cross-sectional area A = 1.7×10 -5 m 2. Resistivity 𝜌 = 1.86×10 -7 Ohm/meter. Substituting the values in the resistance and length formula got by rearranging the ...
May 9, 2019 · Ohm’s Law Solved Problems. Example 1: If the resistance of an electric iron is 50 Ω and a current of 3.2 A flows through the resistance. Find the voltage between two points. Solution: If we are asked to calculate the value of voltage with the value of current and resistance, then cover V in the triangle.
Resistor Colour Code Examples. Q1) Determine the resistance of the given resistor with the given colour sequence (Red, Green, Red, Gold). As we know, the first two colours represent the significant digits of resistance value so the given colours represent digits 2 and 5. The third band is a multiplier band.
Impedance is a combination of resistance and reactance. It is essentially anything and everything that obstructs the flow of electrons within an electrical circuit. Hence, it affects the generation of current through the electrical circuit. It is present in all the possible components of the circuit and across all possible electrical circuits.
Let us understand Thevenin’s Theorem with the help of an example. Example: Step 1: For the analysis of the above circuit using Thevenin’s theorem, firstly remove the load resistance at the centre, in this case, 40 Ω. Step 2: Remove the voltage sources’ internal resistance by shorting all the voltage sources connected to the circuit, i.e ...
Parallel Combination of Cells. When the cells are connected in parallel, the current will be divided among various cells. From the figure, we can see that two cells are connected in parallel. The emf of cell 1 is ε 1, and the emf of cell 2 is ε 2. The internal resistance of cell 1 is r 1, and cell 2 is r 2. The current is split into i 1 and i 2.
