A truck is fitted with a security device. To start the truck, two keys are needed. The first key operates a 'hidden' switch, the second key operates the ignition switch.

If the 'hidden' switch and the ignition switch are both on, the engine will start. 'Turning the ignition switch without operating the 'hidden' switch will not allow the engine to start and will activate an alarm.

A, B and C are the three gates needed for the design of the logic block.

a. Identify gate

i. A 

ii. B

iii. C

b. Copy the diagram and show how the inputs and logic gates are connected together.

c. The logic gates used in the logic block are called digital devices. Explain what this means.

Transcribed Image Text:

LOGIC BLOCK INPUTS OUTPUTS B A alarm hidden switch starter ignition switch motor