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Burglar Alarm
This model examines the logic circuit for a simple burglar alarm. The LED will light when the alarm is armed and either… full details...

SevenSegment Display
This demonstration uses a simple circuit with switches to show how a sevensegment display can be used to build up lette… full details...

Direct Current Filter
This demonstration shows how a capacitor can be used to block the d.c. component of a mixed a.c. / d.c. signal. full details...

Power, Current and Voltage
This activity leads students to establish the relationship between power, current and voltage, P = IV. They should be a… full details...

LDR Current
This activity introduces light dependent resistors, LDRs, and shows that as the light falling upon an LDR increases, its… full details...

RC Time Constant
This model looks at the time taken to charge and discharge a capacitor, and explains the RC time constant of the circuit… full details...

TwoBit Adder
This model uses an OR gate, AND gates, and an inverter, to show how digital logic gates can be used to add two binary di… full details...

Transistor Amplifier
This model is of a simple transistor amplifier. A graph of the input and output voltages shows that the output signal i… full details...

AC and DC
In this activity students will be taught the differences between direct current (d.c.) and alternating current (a.c.), a… full details...

Capacitors and Resistors in Alternating Current
In this model students will see that increasing the frequency of an a.c. supply has no effect on the current in a circui… full details...