P2 Flashcards
Name the device connected in parallel with the component to measure the potential difference
Voltmeter
What’s the type of relationship between current and potential difference for a resistor at constant temperature
Directly proportional
What is potential difference
It’s the driving force that pushes charge around a circuit
What happens to potential difference in a series circuit
Potential difference is shared between the components
What happens to current in a series circuit
Current is the same everywhere
What happens to current in parallel circuits
Current is shared across the branches
What happens if you add resistors in parallel
It reduces the overall resistance
What colour is the neutral wire and what’s its purpose
Blue and it completes the circuit
What is the frequency and potential difference of UK mains supply
50 Hz and 230 V
What colour is the Earth wire and what’s its purpose
Green and yellow and for safety it stops casing of appliances becoming live it doesn’t typically carry current
What do the step up transformers do
Potential difference is increased and the current is decreased
What is the unit of power
Watts
In a filament lamp as the temperature increases how does this affect resistance
It increases
What should be done to the battery in a circuit to give positive readings if negative readings are shown for the current and potential difference?
reverse the contacts
In a thermistor as the temperature increases how is the resistance effected
Decreases
