Between the amperage and voltage there is a directly proportional relationship, described by Ohm's law.
This law defines the relationship between the current, voltage and resistance in the area of electric circuit.
Think of what the current and voltage.
- Electric current - is ordered for charged particles (electrons). To quantify the value used in physics I, called current.
- Voltage U - is a potential difference at the ends of the circuit section. It is this difference causes electrons to move, like a stream of liquid.
Current is measured in amperes. In electrical circuits, the current strength is determined instrument ammeter. The unit of voltage is volts, measure the voltage in the circuit, you can use a voltmeter. Collect a simple electric circuit of a current source, resistor, ammeter and voltmeter.
With the closure of the circuit and the current passing through itrecord the readings. Change the voltage at the ends of the resistance. You will see that the ammeter will grow with the increase in voltage, and vice versa. This experience demonstrates the directly proportional relationship between the current and the voltage.
An electric current is similar to the fluid flow. But the charged particles do not move to the empty tube, and through the conductor. conductor material has a significant influence on the character of the movement. For a quantitative description of this effect is the value of R - resistance circuit. The unit of resistance is the ohm.
The current strength is greater the higher the voltage resistance and the lower portion of the chain. This dependence is described by Ohm's law:
I = U / R.
For AC saved directlyproportional to the voltage. AC - is electromagnetic waves of harmonic (sinusoidal) character with a frequency determined by the voltage source. In complete an electrical circuit with different resistance connection between the current and the voltage is also described by Ohm's law.