P3.2.6 - Net Resistance And Circuit Calculations Flashcards
What is net resistance?
The total resistance
What happens if you add a second lamp in a series circuit?
The current decreases
The net resistance increases
What happens if you add a second lamp in a parallel circuit?
Total current increases
Net resistance decreases
What can you work out if you know the current and resistance in a series circuit?
The potential difference
What can you work out if you know the potential difference in a series circuit?
The potential difference across the variable resistor
What can you work out if you know the potential difference across the variable resistor and the current through it in a series circuit?
The resistance of the variable resistor
How do you analyse a series circuit?
The current is the same everywhere
The potential differences in each component add up to the potential difference in the battery.
How do you analyse parallel circuits?
The potential difference is the Same across each loop
The current in each loop adds up to the current near the battery
What can you work out if you know the p.d. across the resistor and component as well as the resistance in a parallel circuit?
The current through the resistor
What can you work out if you know the current near the battery in a parallel circuit?
The current through the lamp
What can you work out if you know the p.d. across the lamp and the current through it in a parallel circuit?
The resistance of the lamp
