Electonics

Question 1

Diode

Answer 1

Component that will allow current to flow in one direction only

Question 2

Forward biased

Answer 2

If the positive end of a battery is connected to the positive and of a diode it is said to be ‘forward biased’ and electricity can flow

Question 3

Reverse biased

Answer 3

If the positive end of the battery is connected to the negative end of the diode it is said to be ‘reverse biased’ and no electricity can flow

Question 4

A diode can be used

Answer 4

To change alternating current into direct current

Question 5

Electronic devices such as radios, tape recorders and calculators

Answer 5

Need low voltage direct current

Question 6

Light emitting diode (LED)

Answer 6

Is a diode that gives out light when a current flows through it

Question 7

Current will only flow when an LED is?

Answer 7

Forward biased

Question 8

LED’s use only tiny currents so what must be added?

Answer 8

A resistor must be connected in series with it

Question 9

LED’s are useful because?

Answer 9

They are cheap, reliable and long lasting and use far less current than other light bulbs.

Question 10

Light dependent Resistor (LDR)

Answer 10

Is a resistor whose resistance depends light

Question 11

What happens when light falls on a LDR

Answer 11

It’s resistance decreases, this low resistance will allow current through the circuit

Question 12

What is electronics

Answer 12

Is the careful and exact control of tiny amounts of electric current