What is impedance; is it the same as resistance?
In the following formulae, we will use * to denote multiplication, / to denote division and + and – having their usual meanings. Resistance and impedance are measured in the same units (ohms) but they are not quite the same. Resistance is a measure of the ability of a material to oppose the flow of current. It is determined from Ohm\’s famous law which states that the resistance of a conductor is equal to the voltage across it divided by the current flowing through it. Resistance is usually applied to DC current circuits whereas Impedance, which is dependent on frequency, is used in AC circuits. Ohms Law is usually stated as…. V=I*R So a device (resistor) with a resistance of 10 ohms and having a current of 1 amp flowing through it would have a voltage of 10 volts across its ends, thus V=10 * 1 Resistance works identically for AC and DC. There is another type of opposition to current flow which is dependent on whether the applied voltage is AC or DC and, indeed, on the frequency of t
