Your ... Flashcards
A signal is made of…
1’s and 0’s
Analogue signals can have how many values?
A range
Digital signals can have how many values?
Vary between 2
The more efficient a device is..
The less energy wasted
Light bulb designs have changed to…
Save energy
We can’t have 100% efficient devices because there is…
Always wasteful energy
A sensor is?
A device which detects changes in its environment
Examples of a sensor
Thermometer
Light-dependent resistor (LDR)
Thermistor
Thermometer is quick to … but slow to …
Read
Cool down
Which ***** are on the electromagnet spectrum
Gamma rays
X-ray
MRI
Endoscopes
/\
Reflection
/’’””
At critical angle
/*
Away from normal
Reaction time is?
The time taken for a signal to get from your ears to your brain.
What’s more accurate a light gate or a stop watch
Light gate
Renewable energy is?
Energy that doesn’t run out
What is the strongest waves in the electromagnet spectrum?
Gamma rays
What is the second strongest waves in the electromagnet spectrum?
X - rays
What is the third strongest waves in the electromagnet spectrum?
Ultraviolet (UV)
What is the fourth strongest waves in the electromagnet spectrum?
Visible light
What is the fifth strongest waves in the electromagnet spectrum?
Infared
What is the sixth strongest waves in the electromagnet spectrum?
Microwaves
What is the weakest waves in the electromagnet spectrum?
Radio waves
Filament light bulbs give out more…
Heat
Which light bulb is more efficient
LEDs
What are four ways of generating energy?
Wind turbines
Hydroelectricity
Nuclear
Fossil fuel
Efficiency tells you…?
The ratio of useful energy output to total energy input of a device.
You can use a … in a circuit to detect temperature.
Thermistor
Doctors use visible light in a device called … to see inside a patients body.
Endoscope
When light hits the inside of the glass fibre bigger than the … angle, the light is…?
Critical
Reflected
Doctors can use …, … and … to see inside the patient
Ultrasound
X rays
Endoscopes
What is it called when the glass fibre is bigger than the critical angle and the light is reflected?
Internal reflection
