ELECTRIC CURRENT

1. Direct Current

1.1. an electric current flowing in one direction only. A battery is a good example of a DC power supply.

2. Alternating Current

2.1. an electric current that reverses its direction many times a second at regular intervals, typically used in power supplies.

3. Two Types of Current

4. It deals with the relationship between voltage and current in an ideal conductor.

4.1. The potential difference (voltage) across an ideal conductor is proportional to the current through it.

4.1.1. The constant of proportionality is called the "resistance", R.

4.1.1.1. Ohm's Law is given by: V = I R

4.1.1.1.1. where V is the potential difference between two points which include a resistance R. I is the current flowing through the resistance.

5. It can take the form of a sudden discharge of static electricity, such as a lightning bolt or a spark between your finger and a ground light switch plate. More commonly, though, when we speak of electric current, we mean the more controlled form of electricity from generators, batteries, solar cells or fuel cells.

6. Ohm's Law

7. Electric current is electric charge in motion.

8. Current is usually denoted by the symbol I. Ohm’s law relates the current flowing through a conductor to the voltage V and resistance R

9. Examples:

9.1. Calculate the current by using 12 voltage and 600 resistance

9.1.1. I = 12 V/600 Ohm

9.1.1.1. I = 0.02 A = 20 mA (milli Ampere)