Electricity is associated with the stationary or moving of electric charges - or more simply, the flow of electrical charge. In the nucleus, there are positive and neutral charges called protons and neutrons. The nucleus is surrounded by negatively charged particles called electrons. Electricity is the result of the buildup or motion of electrons and is measured in units called Watts.
What is the importance of electricity?
Electricity has become a necessity to most people in the 21st century. Almost anywhere you look, you can see the workings of electricity. There is electricity in the TV downstairs, in the lights powering a soccer field, and even in the laptop I am writing on right now. Even items that were packaged and manufactured, like food and ordinary household items, have been touched by electricity. Electricity keeps us moving everyday.
What is electric current?
Electric current is the flow of electricity through a conductor and is measured in coulombs per second or amperes. The particles that carry charges through the circuit are called mobile electrons. The direction of an electric current would move towards the positive charges.
I = Q / t
Where Q is charge and t is time.
What is resistance?
The electrical resistance is the ration of the voltage applied to the electric current that it flows through. This definition is shown as
R = V / I
Ohm's Law says that the electric current is the directly proportional to the voltage and indirectly to resistance. This is shown as
I = V / R
If it is constant over a certain range, then Ohm's law can be used to predict the behavior of material.
Resistance is temperature dependent.
Now we know more about electricity!
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