Transistors and Logic Gates

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Ie = Ib + Ic

The equation for working out the current in the emitter terminal of a transistor

base, emitter, collector

The names of the three terminals on a transistor

3

The number of terminals that a transistor has

2

The number of transistors in the circuit diagram for an AND gate

The emitter

The terminal on an NPN transistor that has an arrow drawn on it

The Amp (A)

The unit of current

The Ohm

The unit of resistance

The Volt (V)

The unit of voltage

Increased miniaturisation of electronic components

The use of transistors has helped us to achieve this

1948

The year that the first modern transistor was invented

235mA

A base current of 15mA switches a collector current of 220mA. What is the emitter current?

101mA

A base current of 1mA switches a collector current of 100mA. What is the emitter current?

115mA

A base current of 5mA switches a collector current of 110mA. What is the emitter current?

Transistor

An electronic component that has three terminals. They can act as amplifiers or switches.

NPN

Negative - Positive - Negative. The type of transistor with n-type semiconductor as the two bits of 'bread' in the sandwich, and p-type semiconductor as the 'cheese'.

switches and amplifiers

Transistors can act as these two types of component

logic gates

Transistors can be combined to make these


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