Final answer:
Impedance in a circuit with 10 volts and 2 amps current is calculated as 5 ohms, using the formula Z = V/I.
Step-by-step explanation:
The question is asking to calculate the impedance given the electromotive force (emf) and the current. In this context, impedance is a measure of the opposition that a circuit presents to a current when a voltage is applied. The impedance can be calculated using Ohm's Law, which states that the voltage (V) in a circuit is the product of the current (I) and the impedance (Z), or V = IZ. When given a voltage of 10 volts and a current of 2 amps, the impedance can be found by rearranging the formula, Z = V/I, giving Z = 10V / 2A, which equals 5 ohms.