P2 Flashcards
What is potential difference (voltage)?
The driving force that pushes the charge around (units are volts V)
What is the equation to find potential difference?
Potential difference (V)= Current (A) X Resistance
What does a Ammeter do?
Measures the current (in amps) flowing through the wire.
What does a voltmeter do?
Measures the voltage across the test wire (in volts).
What is a LDR (light dependant resistor)?
A resistir that is dependant on the intensity of light, in bright light, the resistance falls and in darkness the resistance is highest.
What is a thermistor?
A temperature dependant resistor, in hot conditions the resistance deoos and in cool conditions the resistance goes up.
In a series circuit what happens to the total voltage?
It is shared between the various components.
What happens to the current in a series circuit?
The current is the same everywhere.
In a series circuit how are the components connected?
They are connected on 1 straight line.
How are the different components connected in a parallel circuit?
Each component is seperately connected accept from the ammeters.
What happens to the voltage in a parallel circuit?
The voltage is the same across all components.
What happens to the current in a parallel circuit?
It is shared between branches.
What are the two tyoes of electricity supplies?
Alternating current (ac) and direct current (dc).
Wha colour is the live wire and what does it do?
It is brown and it lrovides the alternating potential difference at about 230V.
What colour is the neutral wire and what does it do?
It is blue, it completes the circuit and carries away current. Electricity normally flows in through the live wire and out through the NEUTRAL wire. Its voltage is about 0V.
