Electricity: Electrical Circuits Flashcards
What does Kirchhoff’s first law state?
The sum of all current entering a junction is always equal to the sum of the currents leaving a junction. This is conservation of charge.
What does Kirchhoff’s second law state?
The sum of the e.m.f is equal to the sum of the individual potential differences in a closed loop. This is conservation of energy.
What is the total resistance of resistors in a series circuit?
R = R1 + R2 + R3…
What is the total resistance of resistors in a parallel circuit?
R = 1/R1 + 1/R2 + 1/R3…
What is a potential divider circuit?
A circuit that uses two resistors in series to split or divide the voltage of a supply in a chosen ratio so that a chosen voltage can be provided to another device or circuit.
What is the terminal p.d.?
The potential difference recorded across the terminals of a cell.
