Search results
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 ...
The value of resistance at zero units of temperature is represented as R 0. The curve in Figure 2 represents the typical nature of the resistance of a semiconductor as a function of temperature. Material. Temperature Coefficient of Resistance/0C (at 200 C) Iron (Fe) 0.00651. Aluminium (Al) 0.00429.
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.
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 ...
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 ...
After the switch is closed, find. (a) The time constant of the RC circuit. (b) The maximum charge on the capacitor. (c) The charge on the capacitor 6 s after the switch is closed. Solution: (a) The time constant of the RC circuit, τ = (500 x 10 -3 Ω) (8 x 10 -6) = 4S.
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.
For the above circuit, the total resistance is given as: R total = R 1 + R 2 + ….. + R n The total resistance of the system is just the total sum of individual resistances. For example, consider the following sample problem. A resistor with an electrical resistance value of 100 ohms is connected to another with a resistance value of 200 ohms.
