Circuit analysis Tutorial
AKNM Circuit Magic- circuit analysis software
Electronic component are classed into either being Passive devices or
A Passive Device is one that contributes no power gain to a circuit or system. Examples are
Resistors, Light Bulb, Electrical Heaters. Active Devices are components that are capable of
generating voltages or currents. Examples are Batteries and other Electrical Curent & Voltage
By using schematics symbols we can represent real-life devices.
Resistance -This is a
resistance, measured in units ohms ohms, . Most often it will be a resistor.
This is a source of emf
(electromotive force) or voltage source, with a voltage of , measured in units of volts, V. The
most common source you will see will be a battery. However, batteries are really not
resistance-free. We can model this case by putting a 'resistor' in the circuit which has the
same resistance as the batterys would have.
This is a current source, with
a current of , measured in units of amperes , A. Current source is ideal model of electrical
power source. The internal current source resistance is infinity. We can model real life battery
by putting a 'resistor' in parallel with curent source.