Electronics

Question 1

Relay definition

Answer 1

Acts as a link between so that a lower voltage circuit can control a higher voltage circuit.

Question 2

Why is using a microcontroller preferable to building a prototype?

Answer 2

Cheaper, because they do not require physical components.
Easier to fix mistakes because no real components.
Real, expensive components will not be damaged if a a mistake is made.

Question 3

Why do solar panels help combat climate change?

Answer 3

They reduce the need for power produced from fossil fuels, therefore reduce the amount of CO2 produced.

Question 4

What is the purpose of a diode?

Answer 4

To protect the transistor

Question 5

Advantages of parallel lamps?

Answer 5

All lamps will operate at the same voltage.

If one lamp fails, the others will remain on.

Question 6

How does a MOSFET work?

Answer 6

Voltage across gate < 2V no channel, no current flow

Voltage across gate > 2V channel opens, current flow

As the gate Voltage increases, the drain current increases

Question 7

Difference in the output current between MOSFETs and BJTs

Answer 7

The operation of a MOSFET is controlled by its gate-source voltage

The operation of a BJT is controlled by its base current.

Question 8

Why would someone choose a MOSFET over a BJT?

Answer 8

MOSFETs can handle larger currents and therfore operate larger output devices.

MOSFETs consume less power therfore are more efficient.