P10. Electrons & Electronics

Question 1

Analogue signals

Answer 1

Analogue signals are continuous variations (of amplitude, frequency, or both)

Question 2

Digital signals

Answer 2

Digital signals are a series of pulses with two states, a high state and a low state

Question 3

Transducers

Answer 3

Devices that convert electrical energy into another form, or vice versa

Question 4

State why a logic gate is connected to a relay, rather than directly to the lamp.

Answer 4

The output current of a logic gate is too small to switch on a lamp. The relay switches on a separate circuit with a secondary power source and the lamp in it. (A secondary power source is required.)