13.1- CIRCUIT RULES Flashcards
At any junction in a circuit, what is the total current leaving the junction equal to?
total current entering junction
Why does the circuit rule “at any junction in a circuit, the total current leaving the junction is equal to total current entering junction” hold?
rates of charge flowing into + out of junction always equal
What is the current along a wire defined as?
charge flow per second
What is the current entering a component and current leaving the component like in a series circuit?
same
What is the current passing through through two or more components in series like?
same through each component
Why is the current passing through two or more components in series the same through each component?
rate of flow of charge through each component same at any instant
What is potential difference defined as?
energy transfer per coulomb of charge that flows from one point to other
What is the p.d. when charge carriers lose energy?
p.d. is a potential drop
When do charge carriers gain energy?
when they pass through a battery or cell
What is the p.d. when charge carriers gain energy?
p.d. is potential rise equal to p.d. across battery or cell’s terminal
For two or more components in series what is the total p.d. like?
total p.d. across all components equal to sum of potential differences across each component
What is the p.d. across components in a parallel circuit like?
same
For any complete loop of circuit, what is the sum of emfs round the loop equal to?
sum of potential drops around the loop
What does the circuit rule “for any complete loop of circuit, sum of emfs round loop equal to sum of potential drops around loop” follow from?
fact that total emf in loop is total electrical energy per coulomb produced in loop + sum of potential drops is electrical energy per coulomb delivered round loop
