Electric circuit is a system of electrical components forming a complete an electric current can flows. Electric circuit is compose of source and load.

The drawing below is an example of DC circuit . DC is a source that have a fix polarities.

Source can be in terms of voltage or current. Source is an active elements that is deliver a power to the circuit connected to the loads.

There are two kinds of source: the independent and dependent source.

Independent Source:

                

Dependent Source:

Voltage is a kind of source and it is an electromotive force or potential difference expressed in volts.

Current is a flow of electricity which results from ordered directional movement of electrically charge particles. A quantity representing the rate of flow of electric charge that usually measured in ampere.

POWER is defined as the amount of energy consumed or absorbed per unit time.

P=IV , P=(V x V)/R  or P=P=(I x I) x R

LEARNING’S : I learned that in our daily lives we use voltage and current as the source and the appliances electronics device is the load which can help our lives easier by the help of some scientist discovered a useful thing such as voltage, current and energy.