Electric Components

Question 1

AC
DC
LED
LDR

Answer 1

Alternating current
Direct current
Light emitting diode
Light dependent resistor

Question 2

Name types of resistors and what they do

Answer 2

Variable have a screw or knob which can increase or decrease the amount of resistance

Fixed come in fixed resistance values

Question 3

What’s an LDR

Answer 3

An LDR is high in darkness and low in brightness used to detect light levels eg street lamps they turn on at night

Question 4

What’s a Thermistor

Answer 4

The electrical resistance of a thermistor is high in the cold and low in heat
Used to detect temperature eg oven heating system

Question 5

What is a diode

Answer 5

A device that allows a current to flow in one direction they must be connected the right way around to work
Sometimes used to convert AC into DC

Question 6

What is a transistor

Answer 6

Used to amplify a device (increase)an electrical signal
A small current going in the base of a transistor and is transformed into a bigger current
Eg transisitors are used as electronic switches aim circuits and in a computer

Question 7

How do you find the ohms of a resistor

Answer 7

Look at the colour bands on the resistor write the colours down
Put the first two numbers down eg 6,3 becomes 63 and the last colour u X by ten

Question 8

What does a capacitor do

Answer 8

They stir small amounts of electrical charge
Used in timer circuits they take time to charge.