CT1 Flashcards
Define Electric current?
Electric current (I) is a measure of the amount of charge, ∆Q, flowing past a point in the circuit in a given timeperiod(∆t)
Voltage source symbols?
Current sources?
Define the conservation of energy?
We generally assume that the conservation of energy law applies, i.e. the total power supplied by sources equals the total power absorbed, or dissipated, by the load elements in a circuit.
Equations for power?
Define Branch
Strictly speaking a branch is a portion of the circuit containing only one element.
Define Node
A node is the connection point of a number of branches. There are five nodes in Fig.6, which are labelled 1 to 5.
Define Loop
A loop comprises any closed path around the circuit. Special loops shown by A, B, C, and D in Fig.7(a) that do not cut any branches are termed meshes.
Define mesh?
Kirchhoff’s current law (KCL)?
Kirchhoff’s current law states that at any instant the algebraic sum of currents entering any node in a circuit is zero. In short, at any instant ∑I= 0.
Kirchhoff’s voltage law (KVL)?
Kirchhoff’s voltage law states that at any instant the algebraic sum of voltages around any loop in a circuit is zero. In short, at any instant ∑ V = 0.
Derive two Kirchhoff voltage law equations for the two inner loops of the circuit shown in Fig.Ex7, and use these to determine all the branch currents.
Potential divider equation?
Current division equation?
