Uses Of Electricity And Electronics Flashcards
Explain a diode
A device that allows an electric current to flow in one direction only
Does current flow forward biased or reverse biased
Forward biased
When is a diode used
Its a safety device in a complicated circuit ex. Mobile or computer
What LED stand for
Light emitting diode
When does a LED emit light
When it is forward biased
Give two examples of where an LED
Screens, mobile
Cash register price
What LDR stand for
Light dependent resistor
Explain what a LDR is
Light dependent resistor a resistor whose value of resistance can change light
What effect does bright light and dim light have on LDR
Bright- less resistance and more current
Dim- high resistance and less current
Give two examples when LDR’s are used today
Flash on camera
Streetlights
Explain direct current
A current that flows in one direction
Explain Alternating current
A current flows in a continually changing direction
Give an example of a home object or appliance using d.c. and a.c.
D.C- torch
A.C- Socket
What is the formula for electrical power(W)
Voltage(volts) X Current(amps)
How do you convert Electrical power(W) and kilowatts (kW)
Electrical power divided by 1,000= kilowatts (kW)
Give examples of how water can be heated using electricity
Using a heating coil
Ex- boiling a kettle, immersions heaters
What is the purpose of a fuse
A fuse wire limits the size of the current flowing in a circuit and prevents circuit over-heating
How does a fuse work
Fuse melts breaking the circuit and cutting off the electricity when overheating
Explain the purpose of a circuit breaker
Limits the size of current slowing in a circuit
How does a circuit breaker work
Circuit breakers switches are attracted by a magnet to switch off the circuit and can be turned back on by flicking up the switch
Name the three wires in a plug
Live wire
Neutral wire
Earth wire
What are the colours of the three wires in a plug
Live wire- brown
Neutral wire- blue
Earth wire- Yellow and Green striped
Why is an LED more efficient than a normal bulb
It requires less current to light
