Category: 3. Electronic Circuit laws

Coulomb’s law formula Coulomb’s law calculates the electric force F in newtons (N) between two electric charges q1 and q2 in coulombs (C) with a distance of r in meters (m): F is the force on q1 and q2 measured in newtons (N). k is Coulomb’s constant k = 8.988×109 N⋅m2/C2 q1 is the first charge in coulombs (C). q2 is the second charge in coulombs (C). r is the distance between the 2 charges… Continue reading Coulomb’s Law

Kirchhoff’s Current Law (KCL) This is Kirchhoff’s first law. The sum of all currents that enter an electrical circuit junction is 0. The currents enter the junction have positive sign and the currents that leave the junction have a negative sign: Another way to look at this law is that the sum of currents that… Continue reading Kirchhoff’s Laws

Voltage divider rule for DC circuit For a DC circuit with constant voltage source VT and resistors in series, the voltage drop Vi in resistor Ri is given by the formula: Vi – voltage drop in resistor Ri in volts [V]. VT – the equivalent voltage source or voltage drop in volts [V]. Ri – resistance of resistor Ri in ohms [Ω]. R1 – resistance… Continue reading Voltage Divider

Ohm’s law shows a linear relationship between the voltage and the current in an electrical circuit. The resistor’s voltage drop and resistance set the DC current flow through the resistor. With water flow analogy we can imagine the electric current as water current through pipe, the resistor as a thin pipe that limits the water… Continue reading Ohm’s Law