This third volume of the book series Lessons In Electric Circuits makes a departure from the former two in that the transition between electric circuits and electronic circuits is formally crossed. Electric circuits are connections of conductive wires and other devices whereby the uniform flow of electrons occurs. Electronic circuits add a new dimension to [...]
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AMPLIFIERS2
AMPLIFIERS AND ACTIVE DEVICES
An active device is any type of circuit component with the ability to electrically control electron flow (electricity controlling electricity). In order for a circuit to be properly called electronic, it must contain at least one active device. Components incapable of controlling current by means of another electrical signal are called passive devices. Resistors, capacitors, [...]
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THE SAFE USE OF ELECTRICITY IN THE HOME
Your House Wiring The number of electrical appliances used in modern homes continues to grow, putting extra demands on your electrical system. For this reason you should make sure that the electric wiring in your home is adequate for this increased load. Many older houses contain cables and fittings that may have deteriorated with time [...]
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Switch : Normally Closed And Normally Open
Any kind of switch contact can be designed so that the contacts “close” (establish continuity) when actuated, or “open” (interrupt continuity) when actuated. For switches that have a spring-return mechanism in them, the direction that the spring returns it to with no applied force is called the normal position. Therefore, contacts that are open in [...]
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electric driver motor
The interlock contacts installed in the previous section’s motor control circuit work ¯ne, but the motor will run only as long as each pushbutton switch is held down. If we wanted to keep the motor running even after the operator takes his or her hand of the control switch(es), we could change the circuit in [...]
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Electricity: electric current, resistance, power, voltage
WHAT IS FLOW OF ELECTRICITY? Electric current is defined as the amount of electrical charge that flows per unit time. unit of electric current is A (ampere) or in the written formula I. Electric current is the movement of groups of electrically charged particles in a certain direction. The direction of electric currents flowing in [...]
