An understanding of the basics of electricity
requires the understanding of three fundamental concepts.
•Voltage
•Current
•Resistance
A direct mathematical relationship exists
between voltage, resistance, and current in all electronic circuits.
Current – Current is
the flow of
electrical charge through an electronic
circuit. The direction of a current is opposite to the direction of electron
flow. Current is measured in AMPERES
(AMPS).
Voltage – Voltage is
the electrical force that causes current to flow in a circuit. It is measured in VOLTS.
The flow of water
from one tank to another is a good analogy for an electrical circuit and the
mathematical relationship between voltage, resistance, and current.
Force: The difference in
the water levels ≡ Voltage
Flow: The flow of the
water between the tanks ≡ Current
Opposition: The valve that
limits the amount of water ≡ Resistance
Conventional Current assumes that current flows out of the
positive side of the battery, through the circuit, and back to the negative
side of the battery. This was the convention established when electricity was
first discovered, but it is incorrect!
Electron Flow is what actually happens. The electrons flow
out of the negative side of the battery, through the circuit, and back to the
positive side of the battery.
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