B - Electricity - Energy and Potential Difference Flashcards
What kind of circuit is this?
Series
What kind of circuit it this?
Parallel
What is this?
What is it for?
Light-dependent Resistor
LDR
LDRs, change their resistance according to the amount of light that falls on them. As a result they can be used to monitor light levels. Say you want a light to come on automatically when it gets dark.
What is this?
What is it for?
Thermistor
Thermistors change their resistance according to the temperature around them.
These devices can be used to respond to temperatures, for instance, if you want a cooling fan to come on when a device gets too hot.
What is this?
What is it for?
An LED
Light-emitting Diode
These are devices that produce light when a current is passed through them. Think of your computer. You might have an LED for the power being on.
What is the relationship between resistance and current?
As we add more components into a circuit the resistance of the circuit increases. This has the effect of reducing the current that flows.
Essentially:
more resistance →→→→→→→→→→→ less current
What is the name of the device that can measure current in a circuit?
An Ameter.
What is the relationship between current and voltage?
As voltage increases the current increases.
