Question

What constitutes the current?

Answer 1

Current is a flow of electrical charge carriers, usually electrons or electron-deficient atoms. Current flows from relatively positive points to relatively negative points.
Formula used : As required here we need ohm’s law:
$V = iR$
Here, ${\text{V}}$ is the voltage,
${\text{i}}$ is the current passing through the circuit,
${\text{R}}$ is the resistance of the circuit.

Complete step by step answer
Electric current constitutes of any movement of electric charge carriers, such as subatomic charged particles (e.g., electrons having negative charge, protons having positive charge), ions (atoms that have lost or gained one or more electrons), or holes (electron deficiencies that may be thought of as positive particles).
Ampere is defined as one coulomb of charge moving past a point in one second. If there are $6.241 \times {10^{18}}$ electrons flowing through our frame in one second then the electrical current flowing through it is 'one ampere. Also, Ohm’s law can be used to determine current.

Additional Information
Ohm's law is the fundamental law in the field of electricity. It was discovered by George Ohm, and named after him. Ohm's law provides the relationship between current, voltage, and resistance. It states that the voltage across any resistance is equal to current times the resistance.

Note
Some common applications of ohm’s law in our daily lives are electric Kettles and irons, mobile and laptop charger, conventional domestic fans. It provides variable output voltage based on the resistance and the overall working is controlled by Ohm's Law. The working of heaters, kettles and other equipment also follows this law. Mobile phone & laptop chargers use DC power supply in operations. Ohm's Law states that the current flowing in a circuit is directly proportional to the applied potential difference and inversely proportional to the resistance in the circuit. In other words, by doubling the voltage across a circuit the current will also double.